KR20190008974A - Apparatus and method for supporting mobility management in communication systems with large number of antennas - Google Patents

Abstract

The present invention relates to a beam management in communication systems and, more specifically, to an apparatus and method for supporting mobility management in communication systems with large number of antennas. The method for operating a base station comprises the steps of: transmitting at least one first control beam containing a reference signal for a mobile station to perform measurement; receiving a first measurement report about the at least one first control beam from a mobile station; selecting at least one among the at least one first control beam for at least one control channel to be allocated to the mobile station on the basis of the first measurement report; and transmitting control information to the mobile station through the at least one control channel by using the at least one selected control beam.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for supporting mobility management in a communication system using a plurality of antennas,

The present invention relates to wireless communication, and more particularly, to an apparatus and method for supporting mobility management in a communication system using a plurality of antennas.

Wireless communications is one of the most successful innovations in modern times. In recent years, the number of subscribers to wireless communication services has reached a significant number and is rapidly increasing. Due to the growing popularity among businesses and consumers of other mobile data devices such as smart phones or note pads, computers, net books, eBook readers, The demand for wireless data traffic is increasing rapidly. Therefore, in order to meet the demand for high growth in mobile data traffic, it is very important to increase the radio interface efficiency and allocate a new spectrum.

Accordingly, one embodiment of the present invention provides an apparatus and method for meeting the demand for rapidly increasing wireless data traffic in a wireless communication system.

Another embodiment of the present invention provides an apparatus and method for increasing the efficiency of a wireless interface in a wireless communication system.

Another embodiment of the present invention provides an apparatus and method for using beams having different beam widths in a wireless communication system.

Another embodiment of the present invention provides an apparatus and method for effectively operating beams having different beam widths in a wireless communication system.

According to a first aspect of the present invention, there is provided a method of operating a base station in a wireless network, the method comprising: transmitting at least one first control beam including a reference signal for performing a measurement by a mobile station; For at least one control channel to be assigned to the mobile station based on the first measurement report, the first measurement report for the at least one first control beam from the at least one first control beam And transmitting control information to the mobile station over the at least one control channel using at least one selected control beam. Here, the control information includes at least one resource allocation indicator for the mobile station, and the at least one selected control beam is allocated to the mobile station.

According to a second aspect of the present invention, in a wireless network, a base station apparatus transmits at least one first control beam including a reference signal so that a mobile station performs a measurement, To select at least one of the at least one first control beam for at least one control channel to be assigned to the mobile station based on the first measurement report, And a processor configured to transmit control information over the at least one control channel to the mobile station using at least one selected control beam. Here, the control information includes at least one resource allocation indicator for the mobile station, and the at least one selected control beam is allocated to the mobile station.

According to a third aspect of the present invention, there is provided a method of operating a mobile station in a wireless network, the method comprising: receiving at least one first control beam including a plurality of reference signals from a base station; And transmitting a first measurement report for the at least one first control beams, the first measurement report comprising at least one control channel to be allocated to the mobile station by the base station, And selecting at least one of the at least one first control beam to receive control information over the at least one control channel using at least one selected control beam. Wherein the control information comprises at least one resource allocation indicator for the mobile station and the at least one selected control beam is assigned to the mobile station.

According to a fourth aspect of the present invention, in a wireless network, a mobile station receives at least one first control beam including a plurality of reference signals from a base station, and performs a measurement on the reference signals And configured to select at least one of the at least one first control beam for the at least one control channel to be allocated to the mobile station for the at least one first control beams, And a processor configured to receive control information over the at least one control channel using at least one selected control beam. Here, the control information includes at least one resource allocation indicator for the mobile station, and the at least one selected control beam is allocated to the mobile station.

In wireless communication systems, a plurality of beams having different beam widths are classified and operated according to information or signals to be transmitted, so that radio resources can be used more effectively.

1 is a diagram illustrating a wireless communication network according to an embodiment of the present invention;
FIG. 2A is a diagram illustrating a high level diagram of an Orthogonal Frequency Division Multiple Access (OFDMA) or millimeter wave transmission path according to an embodiment of the present invention;
FIG. 2B is a top level diagram of an OFDMA or millimeter wave receive path according to an embodiment of the present invention; FIG.
FIG. 3A illustrates a transmission path for multiple input multiple output (MIMO) baseband processing and analog beamforming using multiple antennas according to an embodiment of the present invention; FIG.
FIG. 3B is a diagram illustrating a transmission path for MIMO baseband processing and analog beamforming using a plurality of antennas according to another embodiment of the present invention; FIG.
FIG. 3C illustrates a receive path for MIMO baseband processing and analog beamforming using multiple antennas, according to an embodiment of the present invention; FIG.
3D is a diagram illustrating a receive path for MIMO baseband processing and analog beamforming using multiple antennas according to another embodiment of the present invention,
4 illustrates a wireless communication system using antenna arrays in accordance with an embodiment of the present invention;
5 illustrates an example of other beams having different shapes for different purposes within a sector or cell according to an embodiment of the present invention;
6A is a diagram illustrating the use of beams to convey the same or different information to a mobile station or base station in a cell according to an embodiment of the present invention;
Figure 6B illustrates the use of beams to convey control information to a mobile station in accordance with an embodiment of the present invention;
7A and 7B illustrate a method for monitoring serving cells in the case of broadcast beams and control channel beams having substantially the same beam width according to an embodiment of the present invention;
8A and 8B illustrate a method for monitoring serving cells in the case of broadcast beams and control channel beams having different beam widths according to an embodiment of the present invention;
FIGS. 9A, 9B, 10A, and 10B illustrate cell monitoring in an idle mode or an initial network entry according to an embodiment of the present invention;
11 is a diagram illustrating examples of beam and cell monitoring and handover in accordance with an embodiment of the present invention;
Figure 12 illustrates a mobile station combining a plurality of beams for transmitting the same control information in accordance with an embodiment of the present invention;
Figure 13 illustrates signal exchange for inter-cell control beam switching in accordance with an embodiment of the present invention;
Figure 14 illustrates signal exchange for inter-cell control beam switching in accordance with another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The following documents or standard documents are included in the present invention as described: F. Khan and Z. Pi, "MmWave Mobile Broadband (MMB): Unleashing The 3? 300 GHz Spectrum", Proc. Sarnoff Symposium, 2011 ("REF1"); Z. Pi and F. Khan, "An Introduction to Millimeter-Wave Mobile Broadband Systems", Communication Magazine, IEEE, June 2011 ("REF2"); Z. Pi and F. Khan, " System Design And Network Architecture For A Millimeter-Wave Mobile Broadband (MMB) System ", Proc. Shannoff Symposium, 2011 ("REF3").

Current 4G (4G) wireless communication systems, i.e., 4G systems, including Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX), are used in units such as bps / Hz / In order to achieve spectral efficiencies close to the theoretical limit, it is possible to use a diversity scheme such as Orthogonal Frequency Division Multiplexing (OFDM), Multiple Input Multiple Output (MIMO), multi-user diversity, link adaptation Use advanced technologies. Continued advances in air-interface performance have been achieved through the introduction of new technologies such as carrier aggregation, higher-order MIMO, coordinated multipoint (CoMP) transmission, and relays. However, further advances in spectral efficiency are expected to be minor.

Another possibility is to use smaller cells if the spectral efficiencies in units such as bps / Hz / cell can not be significantly improved. However, the number of small cells that can be deployed in a geographic area is limited by cost reasons, including acquisition of new locations, installation of equipment, supply of backhaul, and the like. Theoretically, for a one-thousand-fold increase in capacity, the number of cells must also be increased at the same rate. Another disadvantage of very small cells is the frequent occurrence of handoffs leading to network signaling overhead and latency. Therefore, it is difficult to expect the small cell alone to meet the capacity required to accommodate the quantitative increase of mobile data traffic in terms of cost effectiveness, even if the small cells become components of future wireless networks.

In addition to the new technologies described above, more and more technologies are under study to meet the explosive demand for mobile data. The REF1, REF2, REF3, and other documents described above may be used for a Millimeter-wave band (MMB: Millimeter-wave band for Mobile Broadband) for mobile broadband using wide coverage. I will discuss. Due to the small wave lengths, more millimeter wave antennas can be placed in relatively narrow regions, which allows a high-gain antenna to be implemented within a small form factor have. By using the MMB communication, wider bands can be used as compared with the current 4G system, and a higher transmission rate can be achieved.

In current cellular systems, a mobile station (MS) detects a base station (BS) using at least one omni-receiving antennas and transmits at least one omni- transmitting antenna to the base station. These features allow the mobile station to easily receive the downlink control channel from the base station, detect the base station, and also allow the mobile station to easily transmit information to the base station during a random access procedure .

However, in the case of newer cellular systems with directional antennas or antenna arrays, such as the MMB cellular system, one of the challenges is how to enable the mobile station to detect base stations and communicate Can be set. One reason for this problem is that the base station transmits its downlink control channel (e.g., a synchronization channel) or a broadcast channel in directional beams, and the mobile station transmits directional beams Information is transmitted and received. This makes it difficult for the mobile station to detect the base station and attempt random access. According to the prior art (e.g., REF1, REF2, REF3), in a system using directional antennas or antenna arrays, there is a specific technique for solving the problem of how to effectively and reliably support random access to the mobile station's network Not.

The present invention describes an apparatus and method for supporting cell monitoring in millimeter wave broadband communication. Although the present invention is described on the assumption that communication using millimeter waves, the present invention can be applied to other media (for example, a radio wave using 3 to 30 GHz, which is similar to a millimeter wave). In some cases, the present invention may also be applied to electromagnetic waves having a THz (TeraHertz) frequency, infrared rays, visible light or other optical media. For convenience of description, the terms 'cellular band' and 'millimeter wave band' are used, the 'cellular band' represents a frequency of approximately several hundred MHz to several GHz and the 'millimeter band' Respectively. The difference between the two is that radio waves in the cellular band have less propagation loss and can provide superior coverage, but a larger number of antennas are required. The radio waves in the millimeter wave band exhibit higher propagation losses, but provide high gain antennas or antenna arrays within small form factors.

As mentioned above, millimeter waves generally represent radio waves, corresponding to radio frequencies in the range of 3 GHz to 300 GHz, having a wavelength in the range of 1 mm to 100 mm. According to definitions by the International Telecommunications Union (ITU), these frequencies are referred to as the Extremely High Frequency (EHF) band. These radio waves exhibit unique propagation characteristics. For example, compared to lower frequency radio waves, the millimeter wave has a higher propagation loss and has poor ability to penetrate objects (e.g., buildings, walls, trees) ), Airborne particles (eg, raindrops), and are more susceptible to diffraction and diffraction. However, due to the short wavelength, more millimeter wave antennas can be installed in a relatively small area, which allows implementation of high gain antennas within small form factors. Moreover, due to the above disadvantages, these radio waves are used less than radio plates of lower frequency. Thus, the spectrum of such a band can be obtained at low cost.

The ITU defines a frequency of 3 GHz to 30 GHz as SFH (Super High Frequency). The frequencies in the SHF are similar to radio waves in the EFH band (e.g., millimeter waves), such as the possibility of implementation of antennas with high propagation loss and high inductivity in small form factors.

A large amount of spectrum is available in the millimeter waveband. For example, the millimeter waveband has been used in a short range within 10 meters. However, existing techniques in the millimeter waveband have not been optimized for commercial mobile communications with wider coverage, and there is currently no noticeable commercial mobile cellular system in the millimeter waveband. In the present invention, a mobile broadband communication system using a frequency of 3 to 300 GHz is referred to as MMB.

In accordance with an embodiment of the present invention, existing techniques for mobile communication may utilize the millimeter wave channel as an additional spectrum for data communication. In such a system, a communication station (including different types of mobile stations, base stations, and base stations) can perform communications using both cellular and millimeter wave bands. The cellular bands may be at a frequency of about several hundred MHz to several GHz. Compared to millimeter waves, the radio waves of the frequency in the cellular band exhibit less propagation loss, better transmit interference, and are non-line-of-sight (NLOS) It is less sensitive to other disorders such as absorption by particles in other air. It will therefore be beneficial to transmit certain critical control channel signals over the cellular radio frequencies and to use the millimeter wave for high data rate communication.

According to an embodiment of the present invention, both stand alone mobile communication and control / data communication can be performed in the MMB. The communications in the MMB may coexist with current cellular systems (e.g., 4G, 3G, etc.). In situations where the mobile station is in a coverage hole in the MMB system or the signal strength from the base station of the MMB is not strong enough, the mobile station can handover to an existing 3G or 4G cellular system. The base stations of the MMB may include different sizes with an overlay hierarchical network structure, where large cells include small cells.

The present invention mainly describes communication between base stations and mobile stations (e.g., transmission from a base station to a mobile station). Those skilled in the art will recognize that embodiments of the invention described below may also be applied to communications between base stations (e.g., base-to-base station transmissions), communications between mobile stations (transmissions from mobile stations to mobile stations). The present invention can be applied to a communication system having a plurality of antennas, such as a system of MME, RF band, and the like.

FIG. 1 illustrates a wireless communication network according to an embodiment of the present invention. The embodiment of the wireless communication network 100 shown in FIG. 1 is merely an example. Other embodiments of the wireless communication network 100 may be used without departing from the scope of the present invention.

In the illustrated embodiment, the wireless communication network 100 includes a base station 101, a base station 102, a base station 103, and other like base stations (not shown). The base station 101 can communicate with the base station 102 and the base station 103. The base station 101 also communicates with the Internet 130 or a similar Internet Protocol-based network (not shown).

The base station 102 transmits wireless broadband access to the Internet 130 through the base station 101 to the first plurality of subscriber stations in the coverage area 120 of the base station 102 to provide. In the present invention, the term 'mobile station' may be used interchangeably with the 'subscriber station'. The first plurality of subscriber stations may include a subscriber station 111 that may be located in a small business (SB), a subscriber station 112 that may be located in an enterprise (E), WiFi A subscriber station 113 which may be located in a hot spot HS, a subscriber station 114 which may be located in a first residence R, a subscriber station 114 which may be located in a second residence R, A local station 115 and a subscriber station 116 which may be a mobile device (M: Mobile) such as a cell phone, a wireless laptop, a wireless PDA (Personal Digital Assistant)

The base station 103 provides a broadband wireless connection to the Internet 130 via the base station 101 to a second plurality of subscriber stations in the serving area 125 of the base station 103. [ The second plurality of subscriber stations include a subscriber station 115 and a subscriber station 116. In an exemplary embodiment, base stations 101-103 may communicate with subscriber stations 111-116 using OFDM or OFDMA techniques.

Each of the base stations 101 to 103 may have a globally unique Base Station Identifier (BSID). The base station identifier may be a MAC (Media Access Control) ID (IDentifeir). Each of the base stations 101 to 103 may have a plurality of cells (for example, one sector or one cell) having a preamble sequence transmitted in a physical cell identifier or a synchronization channel.

Although only six base stations are shown in FIG. 1 above, it will be appreciated that the wireless communication network 100 may provide broadband wireless access to additional subscriber stations. The subscriber station 115 and the subscriber station 116 are located at the edges of both the service providing area 120 and the service providing area 125 on both sides. Subscriber station 115 and subscriber station 116 may be considered to be operating in a handoff mode and in communication with both base station 102 and base station 103, have.

The subscriber stations 111 to 116 may access voice, data, video, videoconferencing, and / or other broadband services over the Internet 130. For example, the subscriber station 116 may be a wireless device, such as a wireless-enabled laptop computer, a personal digital assistant, a notebook, a portable device, It can be arbitrary. The subscriber stations 114 and 115 may be, for example, a wireless connectable personal computer (PC), a laptop computer, a gateway, or other device.

2A shows a high level diagram of an OFDMA or millimeter wave transmission path according to an embodiment of the present invention, and FIG. 2A shows a high level diagram of an OFDMA or millimeter wave reception path according to an embodiment of the present invention . 2A and 2B, the transmit path 200 may be implemented in the base station 102 and the receive path 250 may be implemented in the same subscriber station as the subscriber station 116 in FIG. 1 . However, the receive path 250 may be implemented in a base station (e.g., the base station 102 in FIG. 1), and the transmit path 200 may be implemented in a subscriber station. All or a portion of the transmit path 200 and the receive path 250 may include at least one processor.

The transmission path 200 includes a channel coding and modulation block 205, a serial-to-parallel (SP) block 210, an inverse fast Fourier transform (NFTFT) block 215, a P- A parallel-to-serial block 220, a CP (Cyclic Prefix) insertion block 225, and an up-converter (UC) 230. The receive path 250 includes a down-converter (DC) 255, a CP removal block 260, a S-to-P (Serial to Parallel) block 265, (Fast Fourier Transform) block 270, a parallel-to-serial block 275, and a channel decoding and demodulation block 280.

At least some of the components of FIG. 2A and FIG. 2B may be implemented in software, while other components may be implemented by configurable hardware or by a combination of software and configurable hardware. In particular, it should be noted that the FFT block and the IFFT block described in this disclosure may be implemented as configurable software algorithms, and the value of the size N may be modified in accordance with that implementation.

Further, while this disclosure is directed to embodiments implementing FFT and IFFT, this is by way of example only and should not be understood as limiting the scope of the disclosure. It will be appreciated that in alternative embodiments of the disclosure, the FFT function and the IFFT function can be easily replaced by a Discrete Fourier Transform (DFT) function and an Inverse Discrete Fourier Transform (IDFT) function, respectively. For the DFT and IDFT functions, the value of the variable N may be any integer (i. E., 1, 2, 3, 4, etc.), while for the FFT and IFFT functions the value of the variable N is an arbitrary (E.g., 1, 2, 4, 8, 16, etc.).

In the transmit path 200, the channel coding and modulation block 205 receives a set of information bits, applies coding (e.g., LDPC (Low Density Parity Code) coding), modulates the input bits Quadrature Phase Shift Keying (QPSK), and Quadrature Amplitude Modulation (QAM)) to generate a series of frequency-axis modulation symbols. The serial-to-parallel block 210 transforms the serial modulated symbols into parallel data, i.e., demultiplexes the parallel modulated symbols so that N is an Nth number of IFFT / FFT sizes used in the base station 102 and the subscriber station 116 And generates a parallel symbol stream. Then, the N-IFFT block 215 performs an IFFT operation on the N parallel symbol streams to generate a serial time-axis signal. Then, the CP insertion block 225 inserts the CP into the time-axis signal. Finally, the up-converter 230 modulates (i.e. up-converts) the output of the CP insertion block 225 to a radio frequency (RF) frequency for transmission over a radio channel. The signal may also be filtered at the baseband prior to conversion to the RF frequency.

The transmitted RF signal arrives at the subscriber station 116 after passing through a radio channel and a reverse operation is performed on the signals at the base station 102. The down-converter 255 down-converts the received signal to a baseband frequency, and the CP removing block 260 removes the CP to generate a serial time baseband signal. The serial-parallel block 265 converts the time baseband signal into a parallel time base signal. Then, the N-FFT block 270 executes an FFT algorithm to generate an N parallel frequency-axis signal. The parallel-to-serial block 275 converts the parallel frequency-axis signal into a series of modulated data symbols. The channel decoding and demodulation block 280 demodulates the modulated symbols and then decodes them to recover the original input data stream.

Each of the base stations 101 to 103 may implement a transmission path 200 similar to that for transmitting in the downlink to the subscriber stations 111 to 116 and may transmit the uplink It is possible to implement a receive path 250 similar to receiving. Similarly, each subscriber-station 116 may implement the transmission path 200 corresponding to the structure for transmission on the uplink to the base stations 101 to 103, And may implement the receive path 250 corresponding to an architecture for receiving at the link.

In an embodiment of the invention, a base station may have one or a plurality of cells, each cell may have one or more antenna arrays, and each array belonging to one cell may have different frame structures (e.g., And the uplink and downlink ratios are different in a TDD (Time Division Duplex) system). Multiple transmit / receive chains may be applied in one array or one cell. One or a plurality of antenna arrays in one cell have the same downlink control channel (e.g., a synchronous channel, a physical broadcast channel, etc.) transmission, and each antenna array has a different channel structure May be transmitted.

The base station may use at least one antenna or antenna array to perform beamforming. The antenna arrays may form beams (e.g., wide beam, narrow beam, etc.) having different widths. The downlink control channel information, the broadcast signal and the message, the broadcast data channel, and the control channel can be transmitted through wide beams. The wide beam may comprise a single wide beam transmitted once or a sweep of continuously transmitted narrow beams. Multicast and unicast data, control signals and messages can be transmitted over narrow beams.

The identifiers of the cells may be transmitted over a synchronization channel. Arrays, beams, etc. may be implicitly or explicitly conveyed through a downlink control channel (e.g., a sync channel, a physical broadcast channel, etc.). The above-mentioned channels can be transmitted over wide beams. By acquiring these channels, the mobile station can detect the identifiers.

The mobile station may perform beamforming using at least one antenna or antenna array. As with the antenna array of the base station, the antenna arrays of the mobile station can form beams of different widths (e.g., wide beam, narrow beam, etc.). Broadcast signals and messages, broadcast data channels, and control channels can be transmitted over a wide beam. Multicast and unicast data, control signals and messages can be transmitted over narrow beams.

FIG. 3A illustrates a transmit path 300 for multiple input multiple output (MIMO) baseband processing and analog beamforming using multiple antennas in accordance with an embodiment of the present invention. The transmission path 300 includes a beamforming architecture in which all signals output from the baseband processing are fully connected to phase shifters and power amplifiers (PA) of the antenna array, ).

As shown in FIG. 3A, N _s information streams are processed by a baseband processing unit (not shown) and then input to a transmission MIMO processing unit 310. After the transmit MIMO process, the information streams are converted to an analog signal in a digital and analog converter (DAC) 312, and an IF (interim frequency) and an RF (radio frequency) And is processed by an up-converter 314. According to an embodiment of the present invention, one information stream may be separated into I (in-phase) and Q (quadrature) signals for modulation. After the IF and RF up-converter 314, the signals are input to a transmit beamforming unit 316.

3A shows one possible structure of the beamforming unit 316, in which signals are seamlessly coupled to all the power amplifiers and phase shifters of the transmit antennas. Each of the signals from the IF and RF up-converter 314 is provided to a phase shifter 318 and a power amplifier 320 and coupled to a combiner (not shown) to be transmitted at one of the antennas of the transmit antenna array 324. [ combiner 322 to combine all the signals. In the Figure 3a, is N _t transmit antennas are included in the transmission antenna array 324. Each antenna transmits a signal via air. The control unit 330 may interact with the transmission modules including the baseband processing unit, the IF and RF up-converting unit 314, the transmission beamforming unit 316, and the transmission antenna array 324. The receiver 332 may receive feedback signals, and the feedback signals may be input to the controller 330. The controller 330 may process the feedback signal and control transmission modules.

FIG. 3B illustrates a transmit path 301 for MIMO baseband processing and analog beamforming using multiple antennas according to another embodiment of the present invention. The transmission path 301 includes a beamforming architecture in which signals output from baseband processing are coupled to power amplifiers and phase shifters in sub-arrays in an antenna array. The transmission path 301 is similar to the transmission path 300 of FIG. 3A except for the differences in the beamforming section 316. FIG.

3B, signals from the baseband are processed through an IF and RF up-conversion unit 314 and processed by the phase shifters 318 and power amplifiers 318 of the sub-array of antenna arrays 324, (320). Here, the sub-array includes N _f antennas. For N _d signals (e.g., output of transmit MIMO processing section 310) from baseband processing, the total number N _t of transmit antennas may be N _d x N _f . The transmit path 310 may include the same number of antennas for each sub-array. However, the present invention is not limited thereto. Alternatively, the number of antennas for each sub-array may not be the same across all sub-arrays.

The transmission path 301 processes one output signal from the transmission MIMO processing unit 310 as an input of RF processing for one sub-array of antennas. However, the present invention is not limited thereto. Alternatively, one or more of the N _d signals from the baseband processing (e.g., the output of the transmit MIMO processing unit 310) may be input to one of the sub-arrays. When a plurality of output signals from the transmission MIMO processing unit 310 are input to one of the sub-arrays, each of a plurality of output signals from the transmission MIMO processing unit 310 includes all of the antennas of the sub- Or a part thereof. For example, the RF and IF processing for each of the sub-arrays of antennas may be the same as the antenna array shown in FIG. 3A, or may be the same as any type of RF and IF processing for the antenna array have. The processing for one sub-array of antennas may be referred to as a single 'RF chain'.

3C illustrates a receive path 350 for MIMO baseband processing and analog beamforming using multiple antennas in accordance with an embodiment of the present invention. The receive path 350 includes a beamforming architecture in which all signals received at the receive antennas are processed through an amplifier (e.g., a low noise amplifier (LAN)) and a phase shifter. The signals are combined in the form of a single analog stream, converted into a baseband signal, and then processed in the baseband.

As shown in FIG. 3C, the N _R receive antennas of the receive antenna array 360 receive signals transmitted by transmit antennas over the air. The signals from the receive antennas are processed by LNAs 362 and phase shifters 364. The signals are then combined in one combiner 366 in the form of one analog stream. In total, N _d analog streams are formed. Each analog stream is converted to a baseband signal by an RF and IF downconverter 368 and an analog to digital converter (ADC) 370. The converted digital signals of N _s information stream and processed by a baseband reception MIMO processor 372 and other baseband processing are restored can be obtained. The control unit 380 interacts with the receiving modules including the baseband processor, the RF and IF downlink processing unit 368, the receiving beamforming unit 363, the receiving antenna array 360, and the like. The controller 380 transmits signals to a transmitter 382 that transmits a feedback signal. The control unit 380 controls the reception modules and determines and generates the feedback signal.

FIG. 3D shows a receive path 351 for MIMO baseband processing and analog beamforming using multiple antennas according to another embodiment of the present invention. The receive path 351 is configured to receive the signals received by the sub-arrays of antenna arrays, and to form analog streams that can be processed in the baseband, architecture. The receive path 351 is similar to the receive path 351 of FIG. 3C except for differences in the beamforming portion 363.

As shown in FIG. 3D, the signals received through the N _fR receive antennas of the subarrays in antenna array 360 are processed by LNAs 362 and phase shifter 364, Gt; 366 < / RTI > There may be N _dR sub-arrays (NdR = NR / NFR), where each sub-array forms one analog stream. Each analog stream may be converted to a baseband signal by the RF and IF downconverter 368 and the ADC 370. The N _dR digital signals are processed by the baseband receive MIMO processing section 372 to recover N _s information streams. The receive path 351 may include the same number of antennas for each sub-array. However, the present invention is not limited thereto. Alternatively, the number of antennas for each sub-array may not be the same for all sub-arrays.

The receive path 351 processes one output signal from the RF processing for one of the antennas into one of the inputs for one baseband processing. However, the present invention is not limited thereto. Alternatively, one or more output signals from RF processing for one sub-array of antennas may be provided to the inputs to baseband processing. When a plurality of output signals from an RF process for one sub-array of antennas are inputs, each of the plurality of output signals from the RF process for one sub-array of antennas is coupled to the sub- May be connected to all or a part of them. For example, the RF and IF processing for each of the sub-arrays of antennas may be the same as the processing for the antenna array shown in FIG. 3C, or any type of RF and IF processing for the antenna array May be the same. The processing for one sub-array of antennas may be referred to as a single 'RF chain'.

According to an embodiment of the present invention, other types of transmission paths and new paths are possible, similar to the paths shown in FIGS. 3A through 3D, but with different beamforming structures. For example, the power amplifier 320 may be present after the combiner 322 so that the number of amplifiers is reduced.

Figure 4 illustrates a wireless communication system using antenna arrays in accordance with an embodiment of the present invention. The embodiment of the wireless communication system 400 shown in FIG. 4 is merely an example. Other embodiments of the wireless communication system 400 may be used without departing from the scope of the present invention.

As shown in FIG. 4, the system 400 includes base stations 401 to 403, mobile stations 410 to 430, and the like. The base stations 410 to 403 may be at least one of the base stations 101 to 103 shown in FIG. Similarly, the mobile stations 410-430 may be at least one of the subscriber stations 111 - 116 of FIG.

The base station 401 includes three cells: cell 0, cell 1, and cell 2. Each cell includes two arrays, i.e., array 0, array 1. In cell 0 of the base station 401, antenna array 0 and array 1 transmit the same downlink control channels in a wide beam. However, array 0 may have a different frame structure than array 1. For example, array 0 may receive uplink unicast communication from mobile station 420 and array 1 may transmit downlink backhaul communication using cell 2 array 0 of base station 402 . The base station 402 may include a wired backhaul connected to at least one backhaul network. A synchronization channel (SCH) and a broadcast channel (BCH) can be transmitted through a plurality of beams having a beam width that is not as wide as the largest transmission beam from the base station 401 shown in FIG. 4 have. Each of the plurality of beams for the synchronization channel or the broadcast channel may have a wider beam width than a beam for unicast data communication, for communication between the base station and a single mobile station.

In the present invention, the transmission beams may be formed by a transmission path as shown in Figs. 3A and 3B. Similarly, the receive beams may be formed by a receive path as shown in FIG. 3C and FIG. 3D above.

At least one of the wireless links shown in FIG. 4 may be disconnected by a line-of-sight (LOS) blockage (e.g., an obstacle such as a car or a person moving on the LOS) May not include a ray that is strong enough to hold the beam. Even when the mobile station is close to the base station and the mobile station travels a short distance, the link can be broken. In this case, if the current link can not be restored, the mobile station must perform switching between links. Even if the mobile station is not at the cell boundary, the mobile station must perform switching of the link.

If each antenna in the array is not located at a high elevation, either transmit beams or receive beams covering the sphere may be used. For example, if each beam has the shape of a pencil, at each sampling point of a 360 degree circle of azimuth search, a 180 degree elevation search is needed . Alternatively, if the antenna is located at a high elevation, at each sampling point of a 360 degree circle of azimuth search, a search of elevation less than 180 degrees May be sufficient.

5 illustrates an example of other beams having different shapes for different purposes within a sector or cell according to an embodiment of the present invention. The embodiment shown in FIG. 5 is merely an example. Other embodiments may be used without departing from the scope of the present invention. The sector / cell shown in FIG. 5 represents at least one base station cell shown in FIG. In the present invention, the beams including the transmission beams and the reception beams may have various beam widths and various shapes, and the shapes may be regular or irregular shapes, and the present invention is not limited to the drawings.

In a sector or cell, one or more arrays having one or more RF chains may generate beams of different shapes for different purposes. In FIG. 5, the horizontal dimension represents an elevation, and the vertical dimension represents an azimuth. As shown in FIG. 5, the wide beams BB 1 and BB 2 are configured for a physical configuration indication channel indicating where the synchronous, physical broadcast channel, and physical data control channel are located . The wide beams BB1, BB2 can carry the same information about the cell.

Although two broad beams BB1 and BB2 are shown in FIG. 5 above, a cell may be configured for one or more BBs. When multiple BBs are present in a cell, the BBs may be distinguished by implicit or explicit identifiers, which may be used to monitor and report BBs in the mobile station. The BB beams are swept and can be repeated. The repetition of information over the BB beams is dependent on the number of receive beams of the mobile station for receiving the BB beam. That is, according to an embodiment of the present invention, the number of repetitions of information through the BB beams may not be less than the number of reception beams of the mobile station for receiving the BB beam.

Broad control channel beams B1 to B4 (collectively, B beams) may be used for the control channels. The control channel beams B1 to B4 may or may not use the same beam width as the wide beams BB1 and BB2. For the mobile station to measure and monitor, the beams B1 to B4 may or may not use the same reference signals as the wide beams BB1 and BB2. The wide beams B1 to B4 are particularly useful for broadcast or multicast towards a group of mobile stations, such as control signals for a particular mobile station, such as mobile station specific control information such as resource allocation for the mobile station.

Although four control channel beams B1 to B4 are shown in FIG. 5 above, a cell may be configured for one or a plurality of B beams. When there are multiple B beams in the cell, the B beams can be distinguished by an explicit or implicit identifier, which can be used by the mobile station to monitor and report the B beams. The B beams are swept and can be repeated. The repetition of information through the B beam depends on the number of receive beams of the mobile station for receiving the B beam. That is, according to an embodiment of the present invention, the number of repetitions of information through the B beams may not be less than the number of reception beams of the mobile station for receiving the B beams. The mobile station may or may not perform the search for the beams B1 to B4 using the information received through the beams BB1 and BB2.

Beams b11 through b44 (collectively, 'b beams') may be used for data communication. One b-beam may have an adaptive beam width. A relatively narrow beam may be used for some mobile stations (e.g., a slow mobile station), and a relatively wider beam may be used for some other mobile stations. The reference signals may be transmitted by the b beams. Although FIG. 5 shows 19 b-beams, a cell may be configured for one or a plurality of b-beams. When the b beams are present in the cell, the b beams may be distinguished by an explicit or implicit identifier, which may be used by the mobile station to monitor and report the b beams. The b beams can be repeated. The repetition of information over the b-beam depends on the number of receive beams of the mobile station for receiving the b-beam. That is, according to an embodiment of the present invention, the number of repetitions of information through the b beams may not be less than the number of receiving beams of the mobile station for receiving the b beam. After the mobile station monitors the beams, the transmission beam b may be locked with respect to one reception beam. If the data information is transmitted via a fixed receive beam, iteration of the information over the b beam may be unnecessary.

6A illustrates the use of beams to convey the same or different information to a mobile station or base station in a cell according to an embodiment of the present invention. The embodiment shown in FIG. 6A is merely an example. Other embodiments may be used without departing from the scope of the present invention.

As shown in FIG. 6A, the beams B1 to B4 (collectively, 'B beams') are transmitted in the same way as the control information for specific devices (for example, mobile station or base station specific control information such as resource allocation for a mobile station) , Control information broadcast / multicast towards a group of devices such as mobile stations and base stations. The control channel (e.g., physical downlink control channel (PDCCH)) that provides common information for resource allocation (e.g., resource block, power control, etc.) SIB (system information block) and mobile station-specific information on resource allocation allocated to a particular mobile station.

The downlink control information (DCI) may be transmitted in a format including both mobile station-specific information and common information for all mobile stations. Like the uplink power control commands, the downlink control information transmits downlink or uplink scheduling information. A dedicated control access may be used for a physical downlink control channel (PDCCH) for conveying the downlink control information.

There may be a plurality of downlink control information formats, some types may include only mobile station specific downlink control information, some types may include only mobile station common information, and some may include mobile station specific information and mobile station common information It can include everything. One or a plurality of PDCCHs may be transmitted using at least one form of downlink control information in a subframe. One control channel element (CCE) composed of several physical resources may be the smallest unit for PDCCH transmission. The PDCCH may include one or more control channel elements. The DL control information and the DL control information format are for communication information at a logical level, and the PDCCH and control channel elements are concepts at a physical level. The PDCCH is a physical channel for transmitting downlink control information belonging to the downlink control information format, and the PDCCH itself can have its own format which does not have an explicit relationship with the downlink control information format.

The mobile station can monitor the set of PDCCH candidates in terms of search space. Here, the search space may be defined as a set of PDCCH candidates, and the definition may use a predefined formula or mapping method for the mobile station. The formula or mapping method may be used to determine the number of PDCCH candidates being monitored in a given search space, a given MAC address, The number of control channel elements in the space, and the like) to the indices of control information elements corresponding to the PDCCH candidates of the search space. The search space may have two types, a mobile station specific space and a common space. The mobile station specific control information may be included in the PDCCH in the mobile station specific search space and the common information may be included in the PDCCH in the common search space. The common search space and the mobile station specific search space may overlap.

The mobile station can monitor the common search space and the mobile station specific search space and performs blind decoding on the PDCCHs. In some cases, the PDCCH may have only a pain search space or only a mobile station specific search space, and the mobile station may perform monitoring corresponding to one of the search spaces. A cyclic redundancy code (CRC) is appended to the PDCCH information, and the MAC ID is implicitly encoded into the CRC, which is also referred to as RNTI. One example of encoding the MAC ID into the CRC is to scramble the MAC ID and XOR (exclusive or) operation with CRC. Another example is to map the MAC ID to the CRC using a hash function or the like. Another example is to use the MAC ID as a parameter for CRC generation to generate a CRC. Other examples may be used.

The PDCCHs in the common search space use a predefined CRC or a reserved CRC, and the CRC can be common to a plurality of mobile stations. The reserved CRC may correspond to a mirror defined or reserved MAC ID or a common MAC ID. One or more reserved CRSs may be used for one or more PDCCHs in the common search space. The mobile station may use a reserved or predefined MAC ID, reserved or predefined CRC, to blind decode PDCCHs in the common search spaces. For PDCCHs within mobile station specific search spaces, a CRC encoded with the MAC ID of the mobile station may be used for mobile station specific information. One example is to scramble the MAC ID of the mobile station by CRC using the XOR operation. When the mobile station blind decodes the PDCCH, it performs blind decoding by using its MAC ID to perform XOR operation using the derived CRC.

As a first example, by using a first specific scrambling code that can be XORed using a CRC on a PDCCH, the PDCCH can convey information common to all mobile stations. Herein, the common information includes resource allocation information for SIBs.

As a second example, by using a second specific scrambling code that can be XORed using the CRC in the PDCCH, the PDCCH can convey information common to all mobile stations. The common information includes at least one of a resource allocation, a resource block allocation and a hopping resource allocation, a modulation and coding scheme (MCS), a redundancy version, a power control information, a scheduled uplink control, Common control signaling provided to all mobile stations, such as power control, CQI (channel quality indicator) request, new data indicator, scheduling information for uplink transmission on the uplink data channel, and so on.

As a third example, by using a mobile station identifier as a scrambling code that can be XORed using a CRC in the PDCCH, the PDCCH can convey information specific to the mobile station identifier, i. E., The mobile station to which the mobile station identifier is assigned . Herein, the information includes at least one of a resource allocation, a power control information, a power control for an uplink control or a data channel, a hybrid automatic repeat request (HARQ) process number, precoding information, an MCS, A data indicator, scheduling information for uplink transmission in an uplink data channel, and the like.

If a PDCCH is received, the mobile station may use blind decoding to decode the PDCCH. Using the XOR operation, the mobile station can detect what scrambling code was used to scramble the CRC, and the mobile station can determine the purpose of the received PDCCH based on the decoded scrambling code. For example, the mobile station can determine whether the PDCCH is a resource allocation for SIBs, for common signaling, or for a resource allocation specific to itself.

The common-PDCCH-common channel may be a PDCCH that carries one or more information common to the mobile stations. For example, if the PDCCH has a form of conveying one kind of information, the common-PDCCH channel may be the PDCCH described in the first example or the second example described above. For example, if the PDCCH is a format conveying multiple types of information common to the mobile stations, the common-PDCCH channel may be a PDCCH carrying both common signaling and resource allocation information of SIBs.

A PDCCH-MS-specific (PDCCH-MS-specific) channel may have a format that conveys information specific to a particular mobile station. In addition, the mobile-specific-PDCCH channel may be a PDCCH that conveys information common to all mobile stations and specific mobile-station specific information.

According to an embodiment of the present invention, all B beams of a cell can transmit the same information to all mobile stations in the cell. For example, as in the cell 601 shown in FIG. 6A, the PDCCH can be transmitted using all the B beams B1 to B4. Here, the PDCCH may include information common to all mobile stations, or may include information specific to one or more individual mobile stations. The beams B1 through B4 may convey identifiers explicitly or implicitly so that the mobile station can identify, monitor and report them. Alternatively, if the mobile station can not identify the B beams, the B beams may not convey the identifier information. These B beams may have the effect of a broad beam including the coverage of all B beams of the cell.

According to another embodiment of the present invention, the B beams of a cell may transmit different information to mobile stations in the cell. For example, as in the cell 602 shown in FIG. 6A, the common-PDCCH channel can use all the B beams B1 to B4. Here, the mobile-specific-PDCCH channel utilizes a particular B-beam covering a particular mobile station located in coverage during B 1 to B 4. Beams B1 through B4 can convey identifiers explicitly or implicitly so that mobile stations can identify, monitor, and report them. Each of the beams B1 through B4 may transmit information associated with mobile stations in its coverage. For example, the related information may include resource allocation (e.g., resource block, power control, etc.) for a data beam to mobile stations in its coverage.

Combinations of the above examples can also be applied. For example, the control information may have two categories. For example, one category may contain common information common to all mobile stations in a cell, and the other category may include information relating only to a group of mobile stations that are in the coverage of each B beam. The common information for an entire group of mobile stations in a cell can be transmitted over all B beams and information relating only to mobile stations within B beam coverage can be transmitted over a particular B beam.

6B illustrates the use of beams to convey control information to a mobile station in accordance with an embodiment of the present invention. The embodiment shown in FIG. 6B is merely an example. Other embodiments may be used without departing from the scope of the present invention.

In FIG. 6B (a), the control beam 610 represents a single control beam that carries data control information to a plurality of mobile stations MS1 to MS5. The control beam carries a PDCCH for the mobile stations MS1 to MS5. The PDCCH includes mobile station-common information for all mobile stations. In addition, the PDCCH includes resource allocation information for each of the MSs MS1 to MS5.

On the other hand, FIG. 6B shows a PDCCH format using multiple beams in the MMB network. The PDCCH includes two parts such as mobile-common-PDCCH-MS-common (PDCCH) information 621 and mobile station-specific-PDCCH information 622. The mobile station-common-PDCCH information 621 is carried by each of the four beams B1 to B4. The mobile-specific-PDCCH information 622 for each mobile station is carried by one beam corresponding to the location of the intended mobile station. For example, the mobile station-specific-PDCCH information 622 for the mobile station MS1 includes resource allocation information transmitted via only beam B1. Since both the mobile station MS4 and the mobile station MS5 are located within the coverage area of the beam B5, the mobile station MS4 and the mobile station-specific-PDCCH information 622 for the mobile station MS5 contain information transmitted via the beam B5. The use of narrow beams that carry MS specific information reduces overhead, which can enhance the reliability of the system.

7A and 7B illustrate a method for monitoring serving cells in the case of broadcast beams and control channel beams having substantially the same beam width according to an embodiment of the present invention. The embodiment shown in FIGS. 7A and 7B is merely an example. Other embodiments may be used without departing from the scope of the present invention.

Referring to FIG. 7A, common control information and common data are transmitted through BB-level beams or B-level beams. The BB-level beams or the B-level beams all transmit the same information, and the BB-level and B-level beam widths are the same. The mobile-specific control information and the mobile-specific data may be transmitted differently in each of the B-level beams or differently in each of the b-level beams. For example, a BB-level beam may be used for transmission of a synchronous channel and a physical broadcast channel, a B-level beam for transmission of a data control channel, and a b-level beam for unicast data transmission.

Referring to FIG. 7B, in step 701, the base station transmits a synchronization signal and a Physical Broadcast Channel (PBCH). For example, the synchronization signal may include at least one of a preamble and a cell ID. Here, the synchronization signal and the physical broadcast channel are transmitted through a BB-level beam. The cells of a millimeter wave communication system can be monitored by using systematic measurements and reporting message exchanges between base stations and mobile stations.

In step 703, the mobile station synchronizes, detects a cell-specific reference signal, and then performs measurements and determines a transmit / receive beam pair at the BB-level. That is, the mobile station scans a synchronization channel transmitted using BB beams (e.g., BB1 to BB4) from one or more base stations. The synchronization channel allows the mobile station to measure the received signal from each base station and to connect to the base station having the measured maximum strength. Reference symbols in the synchronization channel enable the mobile station to synchronize time and carrier with the base station and to measure transmission BB beams.

In step 705, the mobile station selects a good transmit / receive beam pair and monitors the control channels. In other words, the mobile station may select one or more good transmission BB beams for monitoring of a physical control format indication channel (PCFICH) carrying resource location information for other control channels such as the PDCCH. By optimizing both the good transmit BB beam and the receive beam, the mobile station can monitor the PCFICH control channel. Here, optimization for the receive beam is an optional operation. The rejection of beamforming in the receive beam can be considered as a subset of receive beamforming, which is one of a plurality of beams. In some cases, the PCFICH channel is not required in the system, and the PBCH can indicate resource location information and format for other downlink control channels and PDCCHs. In some cases, the PCFICH channel may be referred to by a different name, but may still serve the purpose of indicating format information and resource location information for other control channels.

In the present invention, the measurement of the reference signals or the reference symbols may be performed using a signal to noise ratio (SNR), a reference signal received power (RSRP), a reference signal received quality (RSRQ), a signal to interference and noise ratio (SINR) The signal to interference ratio (SIR), the carrier to interference and noise ratio (CINR), and the carrier to noise ratio (CNR).

Once the mobile station has optimized the transmit BB beam, the mobile station may further transmit reference symbols to refine the beam for one of the B-level transmit beams (e.g., B1 to B4) belonging to the optimized transmit BB beam Can be monitored. If the BB beam has the same beam width as the B transmission beam, adjustment from the BB beam to the B beam may be unnecessary. At the B-level, monitoring may be performed by observing reference symbols in the PDCCHs in the common-PDCCH control channel or common search spaces transmitted in all beams. Using measurements on the reference symbols, the mobile station selects an excellent B transmit beam and a receive beam for monitoring SIBs transmitted on a data channel (e.g., a physical downlink shared channel (PDSCH) transmitted from the base station to the mobile station) do. These SIBs may be referred to as PDSCH SIBs.

In step 707, the base station transmits the PCFICH through a BB-level beam. In step 709, the base station transmits the common-PDCCH on the B / BB-level beam. Also, in step 711, the mobile station continues monitoring using the selected transmit / receive beam pairs. In step 713, the BS transmits the PDSCH SIB through the B / BB-level beam. Accordingly, the mobile station can receive the PCFICH, the common-PDCCH, and the PDSCH SIB. Upon receipt of control channels (e.g., PCFICH, common-PDCCH, PDSCH SIBs), the mobile station will have sufficient information about the system settings needed to configure the data connection with the base station.

The mobile station may attempt to communicate with the base station and the base station may become a serving cell of the terminal after the success of the random access procedure.

In order for the mobile station to communicate with the base station, the mobile station transmits a random access signal and attempts to obtain access.

In step 715, the base station transmits measurement configuration information to the mobile station through a specific step during the random access procedure. For example, the base station may transmit the measurement configuration information to the mobile station via a random access response. The measurement configuration may comprise a configuration or resource allocation of the reference signals of the B / BB-level beams, a metric, a timing (e.g., time interval, period, etc.) for the measurement. In some cases, the measurement configuration from the base station may be omitted.

In step 717, the mobile station monitors the beams at the b-level. Alternatively, the mobile station may monitor the beams at the B / BB-level. Alternatively, the mobile station may monitor the beams at both the b-level and the B / BB-level.

In step 719, the mobile station may transmit measurement information for the B / BB-level to the base station through a specific step during the random access procedure. For example, the mobile station may transmit measurement information in a manner such as indicating which B / BB transmission beams are better, indicating a measured metric for some of the B / BB transmission beams, and so on. For example, the mobile station may transmit the measurement information to the base station via a random access request signal or message, along with a random access request signal or other information in the message. In addition, the mobile station may transmit the measurement information (e.g., an indicator for strong B / BB-level base station transmit beams) to the base station via a standalone message.

After the base station receives the measurement information for the B / BB-level beam from the mobile station, the base station may determine which B / BB-level beams are suitable to contain the mobile station ' s specific data control information . That is, the base station may decide to make the initial attachment of the mobile station the B / BB-level beams of the base station.

In step 721, the base station transmits a mobile-specific-PDCCH on the B / BB-level beam. Here, one or a plurality of B / BB-level beams transmit data control information specific to the mobile station, that is, resource allocation information of the mobile station, uplink power control command, and the like. After the random access procedure is successful, the mobile station will be assigned at least one of a temporary MAC ID, a station ID and an RNTI, and the base station will share the assigned ID information with the mobile station. Thereafter, the BS can use a CRC attached to the PDCCH for transmitting specific information to the MS. Here, the RNTI of the mobile station is encoded into the CRC, and the PDCCH is transmitted on one or a plurality of B / BB beams determined by the base station as being suitable for the mobile station-specific control information. Accordingly, in step 723, the mobile station receives the beam at the B / BB level.

According to another embodiment of the present invention, in step 719, a measurement of the mobile station for a b-level narrow beam of the base station may be reported by the mobile station, and the base station may include control information specific to the mobile station To further determine what the B / BB-level beam is, one can further utilize the measurement for the b-level in addition to the measurement and other information for the B / BB. In step 715, the base station may transmit measurement configuration information to the mobile station through a specific step during the random access procedure, and the measurement configuration includes a configuration of a reference signal of b-level beams and B / BB-level beams Or resource allocation, metrics, and timing (e.g., time intervals, periods, etc.) for the measurements. For example, the base station may transmit the measurement configuration information to the mobile station via a random access response. In some cases, the measurement configuration from the base station may be omitted.

In step 719, the mobile station may transmit measurement information on the B / BB-level and the b-level to the base station through a specific step of the random access procedure. For example, the mobile station may indicate which B / BB-level transmit beams and which b-level transmit beams are better, or which indicate measured metrics for some of the B / BB transmit beams and b-level transmit beams Or the like can be transmitted. For example, the mobile station may transmit the measurement information to the base station via a random access request signal or a message, together with other information in a random access request signal or a message. In addition, the mobile station may transmit the measurement information (e.g., strong B / BB-level base station transmit beams or strong b-level base station transmit beams) to the base station via a standalone message.

After the base station receives the measurement information for the B / BB-level and the b-level from the mobile station, the base station determines which B / BB-level beams suitable for containing the specific data control information of the mobile station You can decide. That is, the base station may decide to make the initial attachment of the mobile station the B / BB-level beams of the base station. Here, one or a plurality of B / BB-level beams transmit data control information specific to the mobile station, that is, resource allocation information of the mobile station, uplink power control command, and the like. The selected B / BB-level beams or beams may include superior b-level beams in their coverage.

After the random access procedure is successful, the mobile station will be assigned at least one of a temporary MAC ID, a station ID and an RNTI, and the base station will share the assigned ID information with the mobile station. Thereafter, the BS can use a CRC attached to the PDCCH for transmitting specific information to the MS. Here, the RNTI of the mobile station is encoded into the CRC, and the PDCCH is transmitted on one or a plurality of B / BB beams determined by the base station as being suitable for the mobile station-specific control information.

The mobile station can set up a physical (PHY) layer measurement configuration with the base station, and the base station sets up using the optimized B-level beam. With this operation, the base station can set up a measurement channel including reference signals using beams at the b-level, which are used by the base station for PDSCH data channels and narrower than B-level transmit beams. The reference signals enable the mobile station to monitor the b-level transmit beams and select an optimal b-level transmit beam to receive the PDSCH data transmission. The feedback of measurements for the optimal b-level transmit beam from the mobile station provides information about the beamforming strategy that can be applied to the base station to support transmission to the mobile station. The mobile-specific-PDCCH information transmitted using the optimal B-level beam indicates parameters for data transmission including the beam index of the b-level transmission beam for the data to be transmitted, the data.

Upon receiving the mobile-specific-PDCCH information at the B / BB-level, the mobile station prepares to receive the PDSCH transmitted using the b-level beam selected from the resource specified by the mobile station-specific-PDCCH information do. Thus, the current cell monitoring can be based on a common-PDCCH, a PDCCH SIB, a B-level at the B-level used to transmit the mobile-specific-PDCCH, at the BB level used to transmit control channels such as PCFICH, And beam monitoring at the b-level for transmission. That is, in step 725, the BS unicasts the PDSCH through the b-level beam. In step 727, the MS receives the PDSCH at the b-level.

For purposes such as synchronizing, acquiring updated system information, performing measurements, etc. when the mobile station is provided with a service from a serving cell, the mobile station may transmit the BB-level beams and the B- It can be continuously monitored.

The common-PDCCH information may include information common to all mobile stations in a cell, such as resource allocation (e.g., resource block, power control, etc.), resource allocation information of SIBs. The mobile-specific-PDCCH information may include resource allocation specific to a particular mobile station.

The common-PDCCH channel may be a channel comprising all of the common information in the PDCCH towards all mobile stations, or it may be a channel including some of the common information in the PDCCH towards all mobile stations. In some cases, the common-PDCCH channel may be a common search space for PDCCHs carrying common-PDCCH information. The mobile-specific-PDCCH channel may be a channel that includes a resource assignment to a specific mobile station, or may further include information in a PDCCH common to all mobile stations. In some cases, the mobile-specific-PDCCH channel may be mobile-specific search spaces for PDCCHs carrying the mobile-specific-PDCCH information. The common-PDCCH channel and the mobile-specific-PDCCH channel may have the same or different physical formats (e.g., same CRC or different CRC).

8A and 8B illustrate a method of monitoring serving cells in the case of broadcast beams and control channel beams having different beam widths according to an embodiment of the present invention.

Referring to FIG. 8A, common control information and common data are transmitted through BB-level beams or B-level beams. The BB-level beams or the B-level beams all transmit the same information, and the BB-level and B-level beam widths are different from each other. The mobile-specific control information and the mobile-specific data may be transmitted differently in each of the B-level beams or differently in each of the b-level beams. For example, a BB-level beam may be used for transmission of a synchronous channel and a physical broadcast channel, a B-level beam may be used for transmission of a data control channel, a b-level beam may be used for unicast data and an information broadcast channel, Lt; / RTI >

Referring to FIG. 8B, in step 801, the base station transmits a synchronization signal and a physical broadcast channel through a BB-level beam. In step 803, the mobile station synchronizes and detects a cell-specific reference signal, and then performs measurement and determines a transmission / reception beam pair at the BB-level. Then, in step 805, the mobile station selects a good transmit / receive beam pair and monitors the control channels, and in step 807, the base station transmits the PCFICH on the BB-level beam. In step 809, the mobile station monitors the transmit (B-level) / receive beam pair, and in step 811, the base station transmits a common-PDCCH on the B-level beam. In step 813, the mobile station selects a good transmission (B-level) / receive beam pair and monitors the control channel. In step 815, the base station transmits the PDSCH SIB through the B-level beam. Then, in step 817, the base station transmits the physical layer measurement configuration through the B-level beam. In step 819, the mobile station monitors the beams at the b-level. Alternatively, the mobile station may monitor the beams at the B-level or BB-level. Alternatively, the mobile station may monitor the beams at both the b-level, the B-level, and the BB-level. Thereafter, in step 821, the mobile station transmits measurement feedback. Then, in step 823, the base station transmits the mobile station-specific-PDCCH through the B-level beam. Thereafter, in step 825, the mobile station prepares to receive information on the designated resource, and in step 827, the base station unicasts the PDSCH through the b-level beam. Accordingly, in step 829, the mobile station receives the PDSCH at the b-level.

As shown in FIG. 8A, the broadcast beams, that is, the BB-level beam and the control channel beam, that is, the B-level beam, use different beam widths. And, as shown in FIG. 8B, the mobile station monitoring the BB-level beam can monitor the B-level beam using the selected superior transmit-receive pair. The remaining procedures are the same as or similar to those shown in the embodiments shown in Figs. 7A and 7B. The embodiment shown in FIGS. 8A and 8B is similar to the embodiment shown in FIGS. 7A and 7B except that the B-level beam uses a different beam width than the BB-level. The scenarios extended from the embodiment shown in Figs. 7A and 7B and Figs. 8A and 8B are described below.

According to a first scenario, the B-level beams and the BB-level beams have the same beam width and are optimized during synchronous transmission from the base station to the mobile station.

According to a second scenario, monitoring of the current cell includes transmission of reference symbols using a BB-level transmission beam included in the control channel. The control information may include a common-PDCCH, a PDCCH SIB, or a mobile-specific-PDCCH that transmits substantially identical information on the downlink to mobile stations.

According to the third scenario, the monitoring of the cell to which the base station is connected includes the transmission of reference symbols using BB-level transmission beams included in the control channels. The control information may include a common-PDCCH, a PDCCH SIB, or a mobile-specific-PDCCH that transmits different information to the mobile station via different BB beams.

According to a fourth scenario, the physical layer measurement configuration for the base station to allow the mobile station to measure and select the optimal b-level transmit beam is based on the assumption that the mobile station is transmitting all b-level transmit beams belonging to the selected B- Level transmit beams belonging to the selected B-level transmit beam, or by tracing a subset of the b-level transmit beams belonging to the selected B-level transmit beam.

According to a fifth scenario, the physical layer measurement configuration for the base station to allow the mobile station to measure and select the optimal b-level transmit beam includes an exclusive feedback for each mobile station to indicate the optimal b- May be configured as a common reference symbol transmission to all mobile stations in the situation where channels are provisioned.

9A, 9B, 10A, and 10B illustrate cell monitoring in an idle mode or an initial network entry according to an embodiment of the present invention. FIGS. 9A, 9B, , The embodiment shown in Figs. 10A and 10B is merely an example. Other embodiments may be used without departing from the scope of the present invention.

In the case of FIGS. 9A and 9B, the BB-level beams and the B-level beams have the same beam width, as shown in FIGS. 9A and 9B. In the case of FIGS. 10A and 10B, the BB-level beams and the B-level beams have different beam widths, as shown in FIGS. 10A and 10B. In the case of FIGS. 9A and 10A, the control beams convey the same information, as shown in FIGS. 9A and 10A. In the case of FIGS. 9B and 10B, as shown in FIG. 9B and FIG. 10B, control beams transmit different information.

Referring to FIG. 9A, in step 901, the neighboring base station transmits the synchronization signal and the physical broadcast channel through the BB-level beam. In step 903, the mobile station synchronizes and detects a cell-specific reference signal, and then performs measurement and determines a transmission / reception beam pair at the BB-level. In step 905, the mobile station selects a good transmit / receive beam pair and monitors the control channels. In step 907, the neighbor base station transmits the PCFICH on the BB-level beam. In step 909, The base station transmits the common-PDCCH over the B / BB-level beam. In step 911, the mobile station continues monitoring using the selected transmit / receive beam pair. In step 913, the neighbor BS transmits a PDSCH SIB on the B / BB-level beam.

Referring to FIG. 9B, in step 961, the neighboring base station transmits the synchronization signal and the physical broadcast channel through the BB-level beam. Then, in step 963, the mobile station synchronizes and detects a cell-specific reference signal, and then performs measurement and determines a transmission / reception beam pair at the BB-level. In step 965, the mobile station selects a good transmit / receive beam pair and monitors the control channels. In step 967, the neighbor base station transmits the PCFICH on the BB-level beam. In step 969, The base station transmits the PDCCH over the B / BB-level beam. In step 971, the mobile station continues monitoring using the selected transmit / receive beam pair. In step 973, the neighbor BS transmits a PDSCH SIB on the B / BB-level beam.

Referring to FIG. 10A, in step 1001, a neighboring base station transmits a synchronization signal and a physical broadcast channel through a BB-level beam. In step 1003, the mobile station synchronizes and detects a cell-specific reference signal, performs measurement, and determines a transmission / reception beam pair at the BB-level. In step 1005, the mobile station selects an excellent transmission / reception beam pair and monitors control channels. In step 1007, the neighbor base station transmits the PCFICH through the BB-level beam. In step 1009, the mobile station monitors a transmit (B-level) / receive beam pair, and in step 1011, the neighbor base station transmits a common-PDCCH on a B-level beam. In step 1013, the mobile station selects a good transmission (B-level) / receive beam pair and monitors the control channel. In step 1015, the neighbor BS transmits a PDSCH SIB through a B-level beam.

Referring to FIG. 10B, in step 1061, the neighboring base station transmits the synchronization signal and the physical broadcast channel through the BB-level beam. Then, in step 1063, the mobile station synchronizes and detects a cell-specific reference signal, and then performs measurement and determines a transmission / reception beam pair at the BB-level. Next, in step 1065, the mobile station selects a good transmit / receive beam pair and monitors the control channels, and in step 1067, the neighbor base station transmits the PCFICH on the BB-level beam. In step 1069, the mobile station monitors a transmit (B-level) / receive beam pair, and in step 1071, the neighbor base station transmits a PDCCH on a B-level beam. In step 1073, the mobile station selects a good transmission (B-level) / receive beam pair and monitors the control channel. In step 1015, the neighbor BS transmits a PDSCH SIB through a B-level beam.

As described above, in an initial network entry or network reentry, the mobile station scans the synchronization channel transmitted from the base station using BB beams (e.g., beam BB1, beam BB2). The synchronization channel allows the mobile station to measure the received signal from each base station and to connect to the base station with the highest measurement strength. The reference symbols of the synchronization channel allow the mobile station to synchronize on the time and carrier with the base station and enable measurements on the transmit BB beams. The mobile station may select one or more good transmission BB beams for monitoring of the PCFICH, conveying the resource location information of other control channels such as the PDCCH. By optimizing both the good transmit BB beam and the receive beam, the mobile station can monitor the PCFICH control channel. The receive beam optimization is an optional operation. The rejection of beamforming in the receive beam can be considered as a subset of receive beamforming, which is one of a plurality of beams.

Once the mobile station has optimized the transmit BB beam, the mobile station may further transmit reference symbols to refine the beam for one of the B-level transmit beams (e.g., B1 to B4) belonging to the optimized transmit BB beam Can be monitored. If the BB beam has the same beam width as the B transmission beam, adjustment from the BB beam to the B beam may be unnecessary. At the B-level, monitoring can be performed by observing reference symbols in a common-PDCCH control channel transmitted in all beams. Using the reference symbols, the mobile station selects good B transmit and receive beams for monitoring the SIBs transmitted on the data channel (e.g., the PDSCH transmitted from the base station to the mobile station). These SIBs may be referred to as PDSCH SIBs. Upon receipt of control channels (e.g., PCFICH, common-PDCCH, PDSCH SIBs), the mobile station will have sufficient information about the system settings needed to configure the data connection with the base station.

The mobile station may attempt to communicate with the base station and the base station may become a serving cell of the terminal after the success of the random access procedure.

If the mobile station is in idle mode, the mobile station may use a similar procedure to monitor the cells. When the mobile station monitors neighboring cells while connected to a serving cell, the mobile station can monitor the cells using a similar procedure.

Figure 11 illustrates examples of beam and cell monitoring and handover in accordance with an embodiment of the present invention. The embodiment shown in FIG. 11 is merely an example. Other embodiments may be used without departing from the scope of the present invention.

After monitoring for cells and beams, the mobile station may perform corresponding operations such as data beam switching, inter-cell beam switching, inter-cell handover, intra-cell handover, and the like. According to an embodiment of the present invention, the mobile station monitors one or more serving cells and neighboring cells in BB-level beams or B-level beams. If certain conditions are met, the mobile station performs handover (e.g., inter-cell handover) from the serving cell to neighboring cells in other cell sites. According to another embodiment, the mobile station monitors neighboring cells in the same cell site as the serving cell. If the specific condition is satisfied, the mobile station performs handover (e.g., cell handover) to cells in the same cell site as the serving cell. The conditions may include at least one of the following items.

At BB-level or B-level, neighboring cells have beams of a signal stronger than a serving cell by a certain threshold.

- The SIR of BB-level beams or B-level beams for neighboring cells is better than a certain threshold value than the serving base station.

- The SINR of the BB-level beams or B-level beams for neighboring cells is better than the serving base station by a certain threshold value.

The conditions to be satisfied for intra-cell handover and the conditions to be satisfied for inter-cell handover may be different. For example, the conditions that must be met for inter-cell handover may be more stringent than the conditions that must be satisfied for intra-cell handover, such that intra-cell handover has a higher priority than inter-cell handover. For example, the threshold for a weak beam from a serving cell and a strong beam difference from a neighboring cell may be larger.

The measurement of the BB-level beams or the B-level beams of the cell may be used to indicate the measurement of the cell. For example, the measurement of a cell may be performed by an optimal BB-level beam or a B-level beam, by a number of excellent BB-level beams or B-level beams, By the average of these. The above conditions may be based on BB-level or B-level measurements, or may be based on the cell measurements. The measurement of the beams (e.g. defined as a stronger beam, weaker beam, etc.) may include the signal strength of the beams, the SIR of the beams, the SINR of the beams, and so on. The measurement of the beams may be based on one or a plurality of transmission beams, one or a plurality of reception beams, or a combination of a transmission beam and a reception beam. For example, one measurement may define a pair of receive beams and transmit beams that are the most intense.

The mobile station may also monitor the data control beams of the serving cell. For example, the data control beams may belong to the B-level. If certain conditions are met, the serving cell asks the mobile station to switch to other data control beams in the cell. Alternatively, the mobile station can request switching or switch. For example, the conditions that must be met include whether the current data control beam is weaker than the other data control beams in the cell by a certain threshold, or that the other data control beam in the cell is stronger than the current data control beam can do. The measurement of the beams (e.g. defined as a stronger beam or weaker beam) may include a plurality of indicators, e.g., the signal strength of the beams, the SIR of the beams, the SINR of the beams, and the like. The measurement of the beams may be based on one or a plurality of transmission beams, one or a plurality of reception beams, or a combination of a transmission beam and a reception beam. For example, one measurement may define a pair of receive beams and transmit beams that are the most intense.

The mobile station may also perform data beam switching in the data control beam. This can be done by measuring beams at the level of narrow beams (e.g., b-level). The narrow beams may be present at the transmitting end, the receiving end, or both. The measurement of the beams may be based on one or a plurality of reference signals. If certain conditions are met, the serving cell may request the mobile station to switch to other data beams in the cell. Alternatively, the mobile station may request switching, or the mobile station may switch.

For operations such as data beam switching, intra-cell control beam switching, intra-cell handover, inter-cell handover, etc., the mobile station monitors the beams and cells and provides a list of serving beams / cells and candidate beams / Management.

Examples 1, 2, and 3 in FIG. 11 show examples of lists that the mobile station can manage. The list may include measurement results. In each example, a pair of transmit and receive beams is used. In the above example 1, the transmission beam monitoring is performed at the BB-level, and the reception beam monitoring is performed at the B-level. In the above example 2, the transmission beam monitoring is performed at the B-level, and the reception beam monitoring is performed at the B-level. In the above example 3, the list consists of a mixture of different levels for the transmission beam and the reception beam. For example, in the list of Example 3 above, transmission beam monitoring may be performed at the b-level, reception beam monitoring may be at the b-level, or transmission beam monitoring may be at the B- Beam monitoring can be done at BB-level, and receive beam monitoring can be done at B-level.

Figure 12 illustrates a mobile station that combines multiple beams to transmit the same control information in accordance with an embodiment of the present invention. In an embodiment of the present invention, a base station can configure all control beams, such as data control beams, to transmit the same control information. The mobile station may receive control information from one or more beams. The mobile station may combine the beams to determine control information. The embodiment shown in FIG. 12 is merely an example. Other embodiments may be used without departing from the scope of the present invention.

As shown in FIG. 12, in step 1201, the base station transmits a measurement and report configuration to the mobile station as the mobile station is in a connected state. In step 1203, the mobile station performs measurements on the beams and cells, and in step 1205, transmits a measurement report to the base station. In step 1207, the base station may cause all control beams of the cell to transmit the same control information as allocation information for all mobile stations in the cell. In step 1209, the base station transmits control information. Thus, the mobile station can receive control information from one or more beams. Then, in step 1211, the mobile station may combine the beams to obtain control information.

The common-PDCCH information may be transmitted and received in the manner described above. If the PDCCH - each of the beams in the cell transmits the same information, e.g., resource allocation information for all mobile stations in the cell, the mobile station-specific information may also be transmitted and received in the manner described above.

Figure 13 illustrates signal exchange for inter-cell control beam switching in accordance with an embodiment of the present invention. In an embodiment of the present invention, the base station switches control beams for the mobile station, and the mobile station itself determines switching. For example, the mobile station may determine switching through blind decoding. The embodiment shown in FIG. 13 is merely an example. Other embodiments may be used without departing from the scope of the present invention.

The base station is configured to transmit all control information, such as data control beams, to the mobile station in order to transmit different control information, such as control information associated with the control beam, i. E. It is possible to construct transmit beams. Each mobile station may be associated with one or more control beams. In other words, the mobile station can be assigned at least one control beam. If the mobile station is associated with a control beam, the mobile station can obtain information related to the mobile station from the received beam. If the mobile station is associated with multiple control beams, the mobile station may combine and process multiple beams to obtain control information.

If certain conditions are met, the mobile station may switch to one or more other control beams. For example, the conditions may be that the control beam or beams to which the mobile station is associated are weaker than the other control beams by a certain threshold value. Here, the measurement may be based on a number of indicators, e.g., signal strength, SIR, SINR, and the like.

As shown in FIG. 13, in step 1301, the base station transmits a measurement and report configuration to the mobile station as the mobile station is in a connected state. In step 1303, the mobile station performs measurements on the beams and cells, and in step 1305, transmits a measurement report to the base station. Based on the measurement, the base station can determine whether the mobile station should switch to another beam for a control channel in the same cell. In step 1307, the base station and the network may select a beam for the control channel to be associated with the mobile station in the same cell. In step 1309, the base station prepares to associate the mobile station with the selected control beam, for example, by including resource allocation information for the mobile station through control information transmitted in the selected control beam. In other words, the base station assigns the selected control beam to the mobile station. Thereafter, in step 1311, the base station transmits control information to the mobile station using the selected control beams. Then, in step 1313, the mobile station determines which control beam should be received. For example, the mobile station may use blind decoding to attempt decoding for multiple control beams, and determine what control beam contains its information. The mobile station associates itself with the control beam. In other words, the mobile station determines that the control beam is allocated. The mobile-specific-PDCCH information may also be transmitted, received, and switched in accordance with the above-described embodiment.

14 illustrates signal exchange for inter-cell control beam switching in accordance with another embodiment of the present invention. According to an embodiment of the present invention, before switching the control beam for the mobile station, the base station can inform the mobile station about the control beam switching. Thereafter, the mobile station performs the control beam switching. The embodiment shown in Fig. 14 is merely an example. Other embodiments may be used without departing from the scope of the present invention.

As shown in FIG. 14, in step 1401, the base station transmits a measurement and report configuration to the mobile station as the mobile station is in a connected state. In step 1403, the mobile station performs measurements on the beams and cells, and in step 1405, transmits a measurement report to the base station. Based on the measurement, the base station can determine whether the mobile station should switch to another beam for a control channel in the same cell. In step 1407, the base station and the network may select a beam for the control channel to be associated with the mobile station, i. E., To be assigned to the mobile station, in the same cell. Thereafter, in step 1409, the base station transmits a request to the mobile station requesting switching to the selected control beam. The base station can identify the selected control beam through a message to the mobile station. After receiving the message, in step 1411, the mobile station prepares to receive a different control beam, e.g., a control beam selected by the base station. In step 1413, the mobile station may send a response to the base station regarding the control beam switching. In step 1415, the base station performs control beam association to the selected control beam for the mobile station. In other words, the base station allocates the selected control beam to the mobile station. For example, the BS may include one or a plurality of resource allocation indicators for the MS in control information transmitted through the selected control channel. Thereafter, in step 1417, the base station transmits control information to the mobile station using the selected control beam. In step 1419, the mobile station receives a new control beam using the receive beam. The receiving beam may be fixed for a new control beam already during a monitoring or measurement trick. The mobile station-specific-PDCCH information may also be transmitted, received, and switched in the manner described above.

According to various embodiments of the present invention, a base station selects a number of candidate beams for a control channel in the same cell.

According to an embodiment of the present invention, the mobile station-related information (e.g., resource allocation information) is transmitted through both the current control beam and the candidate control beam for a certain time before the control beam switching is completed. An advantage of this scheme is that the mobile station can have more opportunities to be associated with the control beam and the possibility of losing the control beam is reduced.

In accordance with an embodiment of the present invention, a handshake for beam locking may be required for intra-cell handover or inter-cell handover.

According to an embodiment of the present invention, in the idle mode, the mobile station may monitor the beams from the base stations. If, after monitoring, the mobile station determines to transmit information (e.g., information related to location update, response to paging, etc.) to the base station, the mobile station may determine, in one or more transmit beams, And transmits the information. The mobile station is configured to steer the transmission beams so that one of the reception beams at the base station can receive the information if the base station keeps one of its reception beams while the mobile station is steering its transmission beams ) Or transmit information through all of its transmission beams by simultaneously generating transmission beams. In one alternative, the mobile station transmits information via one of the picture's transmission beams, such that at least one of the reception beams at the base station can receive the information when the base station is steering its reception beams, The information can be repeatedly transmitted a plurality of times. In another alternative, before the mobile station transmits information, the mobile station transmits training beams to the base station so that it can know the mobile station transmission beam to be fixed to the base station receive beam, The information can be transmitted via a fixed or trained beam.

Methods according to embodiments of the invention described in the claims and / or in the specification may be implemented in hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored on a computer-readable storage medium are configured for execution by one or more processors in an electronic device. The one or more programs include instructions that cause the electronic device to perform the methods in accordance with the embodiments of the invention and / or the claims of the present invention.

Such programs (software modules, software) may be stored in a computer readable medium such as a random access memory, a non-volatile memory including a flash memory, a ROM (Read Only Memory), an electrically erasable programmable ROM (EEPROM), a magnetic disc storage device, a compact disc-ROM (CD-ROM), a digital versatile disc (DVDs) An optical storage device, or a magnetic cassette. Or a combination of some or all of these. In addition, a plurality of constituent memories may be included.

In addition, the program may be transmitted through a communication network composed of a communication network such as the Internet, an Intranet, a LAN (Local Area Network), a WLAN (Wide LAN), or a SAN (Storage Area Network) And can be stored in an attachable storage device that can be accessed. Such a storage device may be connected to an apparatus performing an embodiment of the present invention via an external port. In addition, a separate storage device on the communication network may be connected to an apparatus that performs an embodiment of the present invention.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (28)

A method of operating a base station in a wireless communication system,
Transmitting reference signals to a terminal using a plurality of control beams,
Transmitting to the UE resource allocation information for the UE using at least one first control beam determined based on a measurement of the reference signals among the plurality of control beams;
Receiving a measurement report from the terminal, the measurement report including information about measurements for the at least one first control beam and for at least one second control beam;
And transmitting resource allocation information for the UE using the at least one second control beam based on the measurement report,
Based on the measurement report, switching from the at least one first control beam to the at least one second control beam is performed,
The resource allocation information for the terminal is transmitted through the at least one second control beam while being transmitted through the at least one first control beam in a predetermined time interval before the switching is completed,
Through the at least one first control beam, information specific to the terminal is transmitted,
Wherein the beamwidth of the at least one first control beam is narrower than the beamwidth of the control beam to which resource allocation information for the terminal and information common to a plurality of terminals including the terminal are transmitted.
2. The method of claim 1, wherein the resource allocation information for the UE includes cyclic redundancy code (CRC) encoded by a radio network temporary identifier (RNTI) of the UE, at least one uplink power control command for the UE Including,
Wherein the RNTI is assigned to the terminal when a random access procedure of the terminal is successful.
The method of claim 1, wherein the measurement report is received from the terminal through a random access procedure of the terminal.
2. The method of claim 1, further comprising: based on the measurement report, selecting the at least one second control beam,
Wherein the at least one second control beam belongs to the same cell as the at least one first control beam.
5. The method of claim 4, further comprising: transmitting a request to the terminal requesting switching to the at least one second control beam;
And receiving an acknowledgment of the switching from the terminal.
5. The method of claim 4, wherein if the difference between the signal strength of the at least one second control beam and the signal strength of the at least one first control beam exceeds a predefined threshold, ≪ / RTI > further comprising the step of:
The method of claim 1, further comprising the steps of: communicating with the terminal over a wide beam during initial entry of the terminal or network entry of the terminal;
And communicating with the terminal via a relatively narrow beam after the terminal is connected.
A base station apparatus in a wireless communication system,
A method for transmitting reference signals to a terminal using a plurality of control beams and transmitting the reference signals to the terminal using at least one first control beam determined based on a measurement of the reference signals among the plurality of control beams And receives from the terminal a measurement report including information on the measurement for the at least one first control beam and the measurement for the at least one second control beam, And a processor for transmitting resource allocation information for the terminal using the at least one second control beam,
Based on the measurement report, switching from the at least one first control beam to the at least one second control beam is performed,
The resource allocation information for the terminal is transmitted through the at least one second control beam while being transmitted through the at least one first control beam in a predetermined time interval before the switching is completed,
Through the at least one first control beam, information specific to the terminal is transmitted,
Wherein the beam width of the at least one first control beam is narrower than a beam width of a control beam to which resource allocation information for the terminal and information common to a plurality of terminals including the terminal are transmitted.

The method of claim 8, wherein the resource allocation information for the UE includes cyclic redundancy code (CRC) encoded by a radio network temporary identifier (RNTI) of the UE, at least one uplink power control command for the UE, Including,
Wherein the RNTI is allocated to the terminal when a random access procedure of the terminal is successful.
The apparatus of claim 8, wherein the measurement report is received from the terminal through a random access procedure of the terminal.
9. The apparatus of claim 8, wherein the processing unit selects the at least one second control beam based on the measurement report,
Wherein the at least one second control beam belongs to the same cell as the at least one first control beam.
12. The apparatus of claim 11, wherein the processing unit sends a request to the terminal requesting switching to the at least one second control beam, and receives an acknowledgment of the switching from the terminal.
12. The apparatus of claim 11, wherein the processing unit is further configured to: if the difference between the signal strength of the at least one second control beam and the signal strength of the at least one first control beam exceeds a predefined threshold, And to determine the switching to the second control beam.
The method of claim 8, further comprising: communicating with the terminal over a wide beam during an initial network entry of the terminal or a network entry of the terminal; communicating with the terminal via a relatively narrow beam after the terminal is connected; A device to perform.
A method of operating a terminal in a wireless communication system,
Receiving reference signals transmitted from a base station through a plurality of control beams;
Receiving from the base station resource allocation information for the terminal transmitted through at least one first control beam determined based on a measurement of the reference signals among the plurality of control beams;
Transmitting, to the base station, a measurement report including information on measurements for the at least one first control beam and for measurements for at least one second control beam,
And receiving resource allocation information for the terminal transmitted from the base station using the at least one second control beam,
Wherein utilization of the at least one second control beam is determined based on the measurement report,
Based on the measurement report, switching from the at least one first control beam to the at least one second control beam is performed,
The resource allocation information for the terminal is transmitted through the at least one second control beam while being transmitted through the at least one first control beam in a predetermined time interval before the switching is completed,
Through the at least one first control beam, information specific to the terminal is transmitted,
Wherein the beamwidth of the at least one first control beam is narrower than the beamwidth of the control beam to which resource allocation information for the terminal and information common to a plurality of terminals including the terminal are transmitted.
16. The method of claim 15, wherein the resource allocation information for the UE includes cyclic redundancy code (CRC) encoded by a radio network temporary identifier (RNTI) of the UE, at least one uplink power control command for the UE Including,
Wherein the RNTI is assigned to the terminal when a random access procedure of the terminal is successful.
16. The method of claim 15, wherein the measurement report is transmitted from the terminal through a random access procedure of the terminal.
16. The method of claim 15, wherein the at least one second control beam belongs to the same cell as the at least one first control beam.
19. The method of claim 18, further comprising: receiving a request to switch from the base station to the at least one second control beam;
And transmitting an acknowledgment of the switching to the base station.
19. The apparatus of claim 18, wherein the at least one first control beam is configured such that a difference between a signal strength of the at least one second control beam and a signal strength of the at least one first control beam exceeds a predefined threshold The second control beam is switched to the at least one second control beam.
The method of claim 15, further comprising the steps of: communicating with the base station over a wide beam during an initial network entry of the terminal or a network entry of the terminal;
And communicating with the base station via a relatively narrow beam after the terminal is connected.
A terminal apparatus in a wireless communication system,
Receiving from the base station reference signals transmitted via a plurality of control beams and transmitting from the base station at least one of the plurality of control beams to at least one of the plurality of control beams transmitted via at least one first control beam, And transmits to the base station a measurement report including information on measurements for the at least one first control beam and for measurements for at least one second control beam, And a processor for receiving resource allocation information for the terminal transmitted using the at least one second control beam,
Wherein utilization of the at least one second control beam is determined based on the measurement report,
Based on the measurement report, switching from the at least one first control beam to the at least one second control beam is performed,
The resource allocation information for the terminal is transmitted through the at least one second control beam while being transmitted through the at least one first control beam in a predetermined time interval before the switching is completed,
Through the at least one first control beam, information specific to the terminal is transmitted,
Wherein the beam width of the at least one first control beam is narrower than a beam width of a control beam to which resource allocation information for the terminal and information common to a plurality of terminals including the terminal are transmitted.
The method of claim 22, wherein the resource allocation information for the UE includes at least one of a cyclic redundancy code (CRC) encoded by a radio network temporary identifier (RNTI) of the UE and at least one uplink power control command for the UE Including,
Wherein the RNTI is allocated to the terminal when a random access procedure of the terminal is successful.
23. The apparatus of claim 22, wherein the measurement report is transmitted from the terminal through a random access procedure of the terminal.
23. The apparatus of claim 22, wherein the at least one second control beam belongs to the same cell as the at least one first control beam.
26. The apparatus of claim 25, wherein the processing unit receives a request for switching from the base station to the at least one second control beam and sends an acknowledgment of the switching to the base station.
26. The apparatus of claim 25, wherein the at least one first control beam is configured such that a difference between a signal strength of the at least one second control beam and a signal strength of the at least one first control beam exceeds a predefined threshold The second control beam is switched to the at least one second control beam.
23. The apparatus of claim 22, wherein the processing unit is configured to: communicate with the base station over a wide beam during an initial network entry of the terminal or a network entry of the terminal; and after the terminal is connected, An apparatus for communicating with a base station.

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