KR20030068743A - A Method for transmitting, receiving and processing control information in wireless mobile communication system - Google Patents

Abstract

PURPOSE: A method for transmitting, receiving, and processing control information in a 3GPP(Third Generation Project Partnership) UMTS(Universal Mobile Telecommunications System) is provided so that a UE(User Equipment) receives an HSDPA(High Speed Downlink Packet Access) control signal without transmitting and receiving an HI(HS-DSCH(HSDPA-Downlink Shared CHannel) Indicator) in specific radio environment like a soft hand-over according to the setup of a radio network, performs the DTX(Discontinuous Transmission) of a plurality of symbols according to radio channel environment, and transmits a plurality of HIs. CONSTITUTION: A corresponding UE receives an HI per every sub-frame according to the setup of an RNC(Radio Network Controller)(82). The UE receives an HS-SCCH(High Speed-Shared Control CHannel) indicated by the HI(83), and grasps whether UE-ID information transmitted to the corresponding HS-SCCH indicates the corresponding UE(84). If UE-ID information indicates the corresponding UE, the corresponding UE receives an HS-DSCH, using control information included in the HS-SCCH(85). The corresponding UE simultaneously receives set M HS-SCCHs per every sub-frame according to the setup of the RNC(86). The corresponding UE grasps whether UE-ID information transmitted to the M HS-SCCHs indicates the corresponding UE(87). If UE-ID information indicates the corresponding UE, the corresponding UE receives an HS-DSCH, using control information included in the HS-SCCH(88).

Description

A method for transmitting, receiving and processing control information in wireless mobile communication system}

The present invention relates to a 3GPP UMTS system, and more particularly, to a control information transmission / reception scheme suitable for a system to which a high speed downlink packet access (HSDPA) technology is applied.

Hereinafter, the prior art will be described.

First, a general background of the prior art and the present invention will be described.

UMTS (Universal Mobile Telecommunications System) is a third generation mobile communication system that evolved from the Global System for Mobile Communications (GSM) system, which is a European second generation mobile communication standard.The GSM Core Network and Wideband Code Division Multiple Access (WCDMA) It aims to provide better mobile communication service based on access technology.

The first generation mobile communication refers to the analog method, the second generation mobile communication means the evolution to the digital method, and the third generation method is commonly called IMT-2000, and it means a breakthrough in communication capability.

For the international standardization of UMTS, in December 1998, national or national standards-setting bodies such as ETSI in Europe, ARIB / TTC in Japan, T1 in the United States, and TTA in Korea were established by the Third Generation Mobile Standardization Group (Third Generation). The Partnership Project (hereinafter abbreviated as 3GPP) is formed, and through this 3GPP, detailed specification of UMTS, a European IMT-2000 system, is defined.

In 3GPP, UMTS standardization work is divided into 5 Technical Specification Groups (hereinafter abbreviated as TSG) in consideration of the independence of network components and their operation for rapid and efficient technology development of UMTS. I'm going.

Each TSG is responsible for the development, approval, and management of standards within the relevant areas, among which the Radio Access Network (hereinafter, referred to as RAN) group (TSG-RAN) is the WCDMA access technology (UM) in UMTS. Develop specifications for the functionality, requirements, and interfaces of the UMTS Terrestrial Radio Access Network (hereinafter referred to as UTRAN), a new radio access network to support asynchronous CDMA.

The TSG-RAN Group is again composed of a Plenary Group and four Working Groups. Working Group 1 (WG1) develops standards for the Physical Layer (WG1), while the second Working Group (WG2) works with the Data Link Layer (2nd Layer) and Network Layer (WG2). Role of the third tier).

In addition, the third operation group defines standards for interfaces between base stations, radio network controllers (hereinafter referred to as RNCs) and core networks in the UTRAN, and the fourth operation group requests for radio link performance. Discuss conditions and requirements for radio resource management.

1 is a diagram showing the structure of the UTRAN of the 3GPP system to which the conventional and the present invention is applied.

Referring to FIG. 1, the UTRAN 110 includes one or more Radio Network Sub-systems (hereinafter referred to as RNS) 120 and 130, and each RNS 120 and 130 is connected to one RNC 121 and 131. It consists of one or more base stations (Node Bs) 122, 123, 132, 133 managed by the RNCs 121, 131. The RNC 121 and 131 are connected to a mobile switching center (MSC) 141 for circuit switched communication with a GSM network, and SGSN (for packet switched communication with a general packet radio service (GPRS) network). Serving GPRS Support Node) 142.

The base station (Node B) 122, 123, 132, 133 is managed by the RNC (121, 131), and receives the information sent from the physical layer of the terminal 150 in the uplink, and the terminal 150 in the downlink It serves as an access point of the UTRAN to the terminal transmitting to. The RNCs 121 and 131 are in charge of allocating and managing radio resources. The RNC, which is responsible for the direct management of the base station Node B, is called a control RNC (CRNC).

A place that manages dedicated radio resources allocated to each terminal is called a serving RNC (SRNC).

The control RNC and the responsible RNC may be the same, but when the terminal moves out of the area of the responsible RNC to the area of another RNC, the control RNC and the responsible RNC may be different.

The various components in the UMTS network can be in different locations, so an interface is needed to connect them. The base station Node B and the RNC are connected by an Iub interface, and the RNC is connected through an Iur interface. The interface between the RNC and the core network is called Iu.

2 illustrates a structure of an interface protocol of a 3GPP radio access network standard for wirelessly connecting a terminal and a network through the air.

Referring to FIG. 2, the radio access interface protocol consists of a physical layer (PHY), a data link layer, and a network layer horizontally, and vertically includes a control plane and data information for transmitting control signals. It is divided into user planes for transmission.

Here, the user plane is an area in which traffic information of the user is transmitted, such as voice or IP packet transmission, and the control plane is an area in which control information is transmitted, such as interface or network maintenance and management of a network.

The protocol layers of FIG. 2 are based on the lower three layers of the seven layers of the Open System Interface (OSI) reference model, which are well known in communication systems, and include the first layer L1, the second layer L2, It may be divided into a third layer (L3).

The first layer L1 serves as a physical layer (PHY) for the air interface, and a transport channel with a medium access control layer (hereinafter referred to as MAC) layer on the upper layer. It is connected through the channels and transmits the data delivered to the physical layer through the transport channel to the receiver using various coding and modulation methods suitable for the wireless environment.

The transport channel existing between the physical layer (PHY) and the MAC layer is a dedicated transport channel and a common transport, respectively, depending on whether the terminal can be used exclusively or shared by multiple terminals. It is divided into channels (Common Transport Channel).

The second layer L2 serves as a data link layer, and allows multiple terminals to share radio resources of the WCDMA network. The second layer (L2) is the MAC layer, Radio Link Control (hereinafter referred to as RLC) layer, Packet Data Convergence Protocol (hereinafter referred to as PDCP) layer, and broadcast / multicast control (Broadcast / Multicast Control; hereinafter abbreviated as BMC) is divided into layers.

The MAC layer transfers data through an appropriate mapping relationship between logical channels and transport channels. Logical channels are provided with various logical channels according to the type of information transmitted to the channels connecting the upper layer and the MAC layer.

In general, a control channel is used to transmit control plane information, and a traffic channel is used to transmit information of the user plane.

The RLC layer configures an appropriate RLC PDU for transmission by the segmentation and concatenation function of the RLC SDUs transmitted from the upper layer, and performs an automatic repeat request (ARQ) in charge of retransmission of the lost RLC PDU during transmission. ) Function can be performed.

The RLC SDU or RLC descended from the upper layer operates in three ways: transparent mode, unacknowledged mode, and acknowledgment mode, depending on the method of processing the RLC SDU from the upper layer. There is an RLC buffer for storing PDUs.

The PDCP layer is located on top of the RLC layer and makes data transmitted through a network protocol such as IPv4 or IPv6 suitable for transmission in the RLC layer. In particular, a header compression technique that compresses and transmits header information of a packet may be used for efficient transmission of an IP packet.

The BMC layer enables a message transmitted from a cell broadcast center (CBS) to be transmitted through an air interface. The main function of the BMC is to schedule and transmit a cell broadcast message transmitted to a terminal, and generally transmits data through an RLC layer operating in an unresponsive mode.

For reference, since the PDCP layer and the BMC layer transmit only user data, they are located only in the user plane. Unlike these, the RLC layer may belong to the user plane or to the control plane depending on the layer connected to the upper layer. In the case of belonging to the control plane corresponds to the case of receiving data from the radio resource control (hereinafter referred to as RRC) layer, otherwise it corresponds to the user plane.

In general, a service of transmitting user data provided to the upper layer by the second layer L2 in the user plane is defined as a radio bearer (RB), and the upper layer by the second layer L2 in the control plane. The transmission service of the control information provided by is defined as a signaling radio bearer (SRB).

In addition, as shown in FIG. 2, in the case of the RLC layer and the PDCP layer, several entities may exist in one layer. This is because one terminal has several radio carriers, and generally only one RLC entity and PDCP entity are used for one radio carrier. Entities of the RLC layer and the PDCP layer may perform independent functions in each layer.

The RRC layer located at the bottom of the third layer L3 is defined only in the control plane, and is responsible for control of transport channels and physical channels in connection with setting, resetting, and releasing radio carriers. In this case, the radio carrier setup (RB setup) refers to a process of defining characteristics of a protocol layer and a channel necessary for providing a specific service and setting each specific parameter and operation method.

The WCDMA system described above aims at a transmission rate of 2Mbps in a indoor and pico-cell environment and 384kbps in a general wireless environment. However, as the wireless Internet is becoming more common and the number of subscribers is increasing, more various services are emerging, and higher speeds are required to support them. Therefore, in 3GPP, a research is being conducted to provide a high transmission speed by evolving a WCDMA network, and a representative system is a high speed downlink packet access (hereinafter abbreviated as HSDPA). .

Based on WCDMA, the HSDPA system can support speeds of up to 10Mbps in downlink, and can provide shorter latency and improved capacity. The techniques employed in the HSDPA system to provide improved transmission rates and capacities include Link Adaptation (LA), Hybrid Automatic Repeat Request (HARQ), and fast cell selection. Fast Cell Selection (hereinafter referred to as FCS), and Multiple Input Multiple Output (hereinafter referred to as MIMO) antenna techniques.

The link adaptation technique (LA) uses a modulation and coding scheme (abbreviated as MCS) according to the state of the channel. If the channel state is good, a high modulation such as 16QAM and 64QAM is used. In case the channel condition is not good, a low modulation method such as QPSK is used.

In general, the low-modulation method has a smaller amount of transmission than the high-modulation method, but it shows excellent transmission success rate when the channel environment is not good. Therefore, it may be considered to be advantageous when the influence of fading or interference is large. .

On the contrary, the high modulation methods have a much higher frequency utilization efficiency than the low modulation methods, and can provide a transmission rate of 10 Mbps using the 5 MHz bandwidth of the WCDMA. However, it is very sensitive to the effects of noise and interference.

Therefore, when the terminal is located close to the base station, it is possible to increase the transmission efficiency by using 16QAM or 64QAM, and when the terminal is located at the cell boundary or the influence of fading is low, a low modulation method such as QPSK is useful. Do.

The HARQ method is a retransmission method having a different concept from that of a packet retransmission performed in the RLC layer. This ensures higher decoding success rates by combining data used and retransmitted in conjunction with the physical layer with previously received data. In other words, it is a method of decoding by combining the retransmitted packet with the previous step of decoding while storing the packet which failed to be transmitted without discarding it. Therefore, when used together with the LA technique, the packet transmission efficiency can be greatly increased.

The FCS method is similar to the conventional soft handover. Although the terminal may receive data from multiple cells, the terminal may receive data from a cell having the best channel state in consideration of the channel state of each cell. Conventional soft handover is a method of receiving data from multiple cells and increasing the transmission success rate using diversity, but the FCS method receives data from only one specific cell in order to reduce interference between cells.

MIMO antenna technique is a method that can improve the data transmission speed by using several independent channels in a channel environment where scattering is high. It is a system that is composed of several transmitting antennas and several receiving antennas to obtain diversity gain by reducing the correlation between radio waves received for each antenna.

Meanwhile, the HSDPA system is based on the existing WCDMA network and tries to introduce a new technology while keeping the WCDMA network as it is. However, some modifications are inevitable to incorporate new technologies.

Representatively, the example is an improvement of the existing base station (Node B) function. That is, in the WCDMA network, most of the control functions are located in the RNC, but most of the new technologies for the HSDPA system are managed by the base station (Node B) in order to adapt to the channel situation more quickly and reduce the delay time to the RNC.

However, the extended function of the base station (Node B) is not a function of replacing the RNC, and from the standpoint of the RNC, it can be seen that the functions for the high speed data transmission are in charge of the auxiliary function added.

Therefore, unlike the existing WCDMA system, the base station Node B has been modified to perform a part of the MAC function, and a layer for performing this is called a MAC-hs sublayer.

The MAC-hs sublayer may be located above the physical layer to perform packet scheduling or HARQ and LA functions. In addition, a transport channel called a high-speed downlink shared channel (HSDPA downlink shared channel, hereinafter referred to as HS-DSCH), which is different from the existing transport channel, is used for data transmission for HSDPA.

The HS-DSCH has a short transmission time interval (TTI) (3 slots, 2 ms), unlike the DSCH defined in the conventional WCDMA system standard R'99 / R'4, and has a high data rate. It supports various modulation code set (MCS) that can be used. Optimum performance can be obtained by selecting the best MCS for the channel situation.

To this end, hybrid ARQ (HARQ) technology, which combines automatic repeat request (ARQ) technology and channel coding technology, ensures reliable transmission and uses code division multiplexing (CDM). It is proposed to support up to four users at the same time. The physical channel corresponding to the transport channel HS-DSCH exists as in the prior art.

As described above, transmission of control information is required for the HS-DSCH, and the information is a high speed downlink shared channel (HS- Shared Control CHannel; HS-SCCH), which is a shared control channel introduced in the HSDPA standard. Is transmitted.

For reference, Release 1 and Release 2 are the standard versions for Global System for Mobile Communication (GSM) respectively, and R'99 is the abbreviation of Release 1999, referring to the standard version of 3GPP. , Same as Release 3).

R4 refers to the standard version of 3GPP and is an acronym for Release 4 (released in March 2001, same as Release 2000).

Release 5 is also the version that is currently being standardized.

A physical channel corresponding to the transport channel HS-DSCH will be described.

The 3GPP system supports high speed packet data service in downlink with HS-DSCH transmission.

To this end, a new structure of a transport channel (HS-DSCH) and control signaling for it has been proposed. 5 illustrates a structure of a physical channel HS-PDSCH to which an HS-DSCH is mapped.

The HS-PDSCH is transmitted in one or multiple SF = 16 codes. The HS-DSCH subframe consists of three slots. HS-PDSCH is modulated with QPSK or 16 QAM.

3 is a subframe structure for the HS-PDSCH.

As described above, transmission of control information for the HS-DSCH is required. This information is transmitted on the physical channel HS-SCCH.

Control information can be largely divided into transport format and resource related information (hereinafter referred to as TFRI) and hybrid automatic repeat reQuest (hereinafter referred to as HARQ) related information.

The TFRI includes information on the HS-DSCH transport channel set size, modulation method, coding rate, and number of multi-codes. HARQ-related information includes block number ), Such as redundant versions.

In addition, information about a terminal identifier (UE identification, hereinafter referred to as UE-Id) for notifying which user's information is transmitted. Information related to the UE-Id is performed by performing a cyclic redundancy check (CRC) operation together with TFRI and HARQ information to transmit only the resulting CRC information.

The sub-frame structure of the HS-SCCH for transmitting downlink control information is shown in FIG.

Transmission structure of the HS-SCCH for one UE is shown in FIG. The number of HS-SCCHs configurable in one UE is M = 4.

FIG. 6 shows a high speed downlink packet access indicator (hereinafter referred to as HI) and timing of HS-SCCH and HS-DSCH.

In FIG. 6, HI is transmitted on a DPCH of a UE related to the HS-DSCH, which serves as an indicator for informing the UE that data will be transmitted through the HS-DSCH.

That is, when a bit of HI is set, the UE may read control information transmitted through a shared control channel and recover data of the HS-DSCH. The time offset (t _HS-DSCH-HI ) between the slot of the downlink dedicated physical channel (DL DPCH) transmitting the HI and the start of the HS-SCCH overlaps the beginning of the HI and the first slot of the HS-SCCH. Set it to

HI is generated in a base station Node B to which a cell transmitting the corresponding HS-DSCH belongs. The transmission of HI is transmitted through a downlink associated DPCH only when the number of HS-SCCHs allocated to one UE is two or more.

In this case, the DPDCH symbol, which is promised to transmit HI in every 3 slots, is defined as a 'HI transmit symbol', where the HI informs the HS-SCCH that the UE should decode at a specific moment.

If there is HS-DSCH data to be received by the UE, HI is transmitted for every third slot of an associated DPDCH corresponding to the HS-DSCH TTI. A dedicated channel (DCH), which is not related to HSDPA, is mapped to a dedicated physical data channel (hereinafter referred to as DPDCH), and transmitted user data (voice, video data, etc.) or higher signaling information is transmitted.

HI puncturing one symbol (2 bits) transmitted on the DPDCH and is transmitted instead. If there is no HS-DSCH data to be received by the UE, HI is not transmitted, and one symbol of the position where the HI of the corresponding DPDCH is transmitted is transmitted and discontinuously transmitted (hereinafter referred to as DTX (Discontinuous Transmission)). Since HI is transmitted in only one symbol, high transmission power may be required for the HI when the UE is in soft handover. However, if the UE is not in a soft handover situation, high transmit power is not required for HI.

7 shows a coding scheme of HI. If HI is P0, it corresponds to DTX, indicating that there is no data transmission at that moment. When HI is transmitted to one of P1, P2, P3, and P4, it informs which channel should be decoded among four HS-SCCHs mapped to each.

In the prior art, the HI transmit power is very high in a specific channel environment, so that when trying to transmit HI, it becomes difficult for the base station to allocate enough power to other channels to transmit. This is because HI transmits the DTX data symbol with QPSK modulation. That is, since only one symbol is transmitted, high transmission power must be allocated to HI in order for a UE in a specific channel environment such as soft handover to receive HI correctly.

Therefore, in order to solve the above problems, the present invention has proposed a process of transmitting and receiving the HSDPA control signal,

First, in the conventional method, the UE transmits HI for all channel environments so that the UE receives the HSDPA control signal. However, in the present invention, HI does not correspond to HI transmission and reception in a specific wireless environment such as soft handover according to the wireless network setting. Allow the UE to receive the HSDPA control signal.

In addition, in the conventional method, HI is transmitted while only one symbol is QPSK modulated for all channel environments within a predetermined period of time, but in the present invention, a plurality of symbols are DTXed according to an untrusted channel environment to transmit HI.

1 is a view showing the structure of the UTRAN of the 3GPP system to which the prior art and the present invention is applied

2 is a structure of an interface protocol of a 3GPP wireless access network standard for wirelessly connecting a terminal and a network through the air

3 shows a subframe structure for a high speed physical downlink shared channel (HS-PDSCH)

4 shows a subframe structure of a high speed downlink shared control channel (HS-SCCH) for transmitting downlink control information;

5 is a view illustrating a transmission configuration concept of a fast downlink shared control channel and a dedicated channel for one terminal;

6 is a diagram illustrating timing of a high speed downlink shared control channel (HS-SCCH) and a high speed downlink shared channel (HS-DSCH).

7 is a diagram illustrating a coding scheme of a fast downlink packet access indicator (HI).

8 is a flowchart illustrating an example of a method of transmitting and receiving control information transmitted by a shared control channel.

9 is a flowchart illustrating another example of a method of transmitting and receiving control information transmitted by a shared control channel.

In the wireless mobile communication system according to the present invention for achieving the above object, in the present invention, the present invention transmits or receives a control signal at a transmitting end or a receiving end, the UTRAN is between the base station (Node B) and the terminal (UE) Determining whether to transmit / receive HI in consideration of a wireless environment or a configuration of a dedicated channel, and setting up a base station (Node B) and a UE (UE) to transmit / receive HI or not to transmit / receive HI according to the determination; If the UE is configured to transmit and receive HI, the UE always receives the HI first, and then receives the shared control channel (HS-SCCH) according to the information of the HI, or if the UE is configured not to transmit or receive the HI. And receiving the shared control channel (HS-SCCH) at all times without receiving the HI.

In more detail, the present invention provides a system for transmitting data to a receiving end via a radio section in a channel not dedicated to the receiving end, and transmitting control information for the channel to another channel not dedicated to the receiving end. It is characterized in that whether to check the state of the wireless section and transmit an indicator indicating that the data is transmitted through the dedicated channel and the shared channel according to the test result.

Here, the inspection of the state of the wireless section may be based on the strength of the transmission power set to transmit the indicator, and also the state in which the terminal, which is a receiving end, enters the handoff state or returns from the handoff state. You can do it.

In addition, the present invention transmits control information at the transmitting end,

DTX the plurality of symbols according to the radio transmission channel environment to transmit the HI information represented by the plurality of symbols.

In addition, the present invention provides a method for the receiving end to vary the method of receiving the control information according to whether or not the indicator sent.

The objects and features according to the present invention will become apparent from the following detailed description of the embodiments with reference to the accompanying drawings.

The following describes an example of a method of transmitting and receiving control information transmitted by the shared control channel.

The radio network controller (RNC) determines whether HI exists for the corresponding UE, and then configures the UE and the base station Node B. Therefore, the base station Node B and the UE UE configured to transmit and receive data through the HS-DSCH may be configured to transmit and receive HI to a base station Node B and the UE. The other base station Node B and the UE may be configured not to transmit or receive HI.

At this time, the wireless network controller may be configured using a Node B using a Radio Link Setup or Radio Link Reconfiguration, a Radio Link Addition, a Radio Link Deletion process, or the like. B) and HI is set to transmit or receive HI or not.

The wireless network controller may configure HS-SCCH and HS-DSCH channels for the corresponding Node B and UE together with HI configuration.

At this time, the maximum number of HS-SCCHs configured for the UE is M. Where M is one or a positive integer value greater than one. The M value is set by the radio network controller.

The radio network controller may reset the maximum number of HS-SCCHs preset for the UE.

The radio network controller may be configured to transmit / receive HI or not to transmit / receive HI to a corresponding UE and a base station Node B as follows.

First, when the HI transmission power (hereinafter referred to as HI power) required for the UE (UE) is a large value, the base station (Node B) and the UE (UE) is set not to transmit and receive HI. For example, when HI power is 5% or more of the total transmission power of the base station Node B, the base station Node B and the terminal UE are configured not to transmit or receive HI.

Secondly, when HI power required for the UE is small, the base station Node B and the UE set to transmit and receive HI. For example, when HI power is 5% or less of the total transmission power of the base station Node B, the base station Node B and the terminal UE are configured to transmit and receive HI.

Third, when the UE is in a soft handover situation or when the UE enters the soft handover state, the base station Node B and the UE are configured not to transmit or receive HI. . In particular, when the UE enters a soft handover state between base stations, the base station Node B and the UE do not transmit or receive HI.

Fourth, when the UE is not in the soft handover state or exits the soft handover state, the UE B and the UE are configured to transmit and receive HI. In particular, when the UE is not a soft handover between base stations or comes out of a soft handover state between base stations, the base station Node B and the terminal UE are configured to transmit and receive HI.

If the base station Node B is configured to transmit and receive HI with the UE, and the offset of the HI power set by the radio network controller is large for the base station Node B, then the base station (Node B) may report to the radio network controller that the offset of the preset HI power is a very large value.

The wireless network controller receiving the report of the base station Node B may reset the base station Node B and the UE so as not to transmit or receive HI. In this case, the offset of the HI power means a difference between the transmission power of the dedicated channel or the shared channel and the HI transmission power.

On the contrary, when the base station Node B and the UE UE are configured not to transmit or receive HI, when the power consumption of the base station Node B is sufficient to transmit and receive HI, the radio network controller is connected to the base station Node B. The UE may be reconfigured to transmit and receive HI.

Hereinafter, a process of receiving control information of a terminal (UE) when it is set to transmit and receive HI and when it is set not to transmit HI will be described.

As shown in Fig. 8, the radio network controller first sets to transmit HI or not to transmit HI for the reason given above. (Step 81)

First, when the HI is set to transmit and receive, a process of receiving control information of the UE will be described.

The UE receives the HI every sub-frame (2 msec) according to the setting of the radio network controller. (Step 82).

After receiving the HI, the UE receives the HS-SCCH indicated by the HI. (Step 83). At this time, it is determined whether the UE-Id information transmitted on the corresponding HS-SCCH indicates the corresponding UE. (Step 84).

If the received UE Id information indicates the UE, the UE receives the HS-DSCH using control information included in the HS-SCCH. (Step 85).

The control information reception process is repeated every sub-frame (2 msec).

The following describes a process of receiving control information of a UE when it is set not to transmit or receive HI.

According to the setting of the radio network controller, the corresponding UE receives M HS-SCCH channels configured at every sub-frame (2 msec) simultaneously. (Step 86).

At this time, the UE UE determines whether UE ID information transmitted on M HS-SCCH indicates the corresponding UE. (Step 87).

When one of the received UE ID information indicates the UE, the UE receives the HS-DSCH using control information included in the HS-SCCH transmitting the UE-Id. (Step 88).

The control information receiving process is repeated every subframe (2msec).

Next, another example of a method of transmitting and receiving control information transmitted by the shared control channel will be described.

As shown in FIG. 9, first, the radio network controller configures the UE to receive HI transmitted when the HS-DSCH and HS-SCCH are configured for a UE. At this time, the wireless network controller also sets an offset of HI power. (Step 91).

Before the Node B determines whether to transmit data through the HS-DSCH in every sub-frame, an offset value of HI power preset to the UE is currently set. Determine whether or not the base station Node B is too large to transmit. (Step 92).

If the preset HI power offset value is a value that can be transmitted with power of the corresponding Node B, the Node B transmits HI to the UE. Since the process is the same as FIG. (Step 93).

If the preset HI power offset value is so large that it cannot be transmitted with power of the corresponding Node B, the Node B does not transmit HI to the UE, and transmits data through the HS-DSCH. Also stop. (Step 94).

When the configuration of the radio channel for the UE (UE) or the HI power offset is newly set, the base station Node B repeats the process shown in FIG. 9 from the beginning.

An example of the HI transmission scheme will be described below.

The wireless network controller sets or resets the repetition of the HI symbol and the number of repetitions N as follows. Where N corresponds to a positive integer of 1 or greater.

First, the HI symbol is repeatedly transmitted N times according to the HI transmission power required for the corresponding UE. In this case, for DP transmission, N DPDCH symbols are punctured. HI is sent to the puncturing DPDCH symbol position. For example, when the required HI transmit power is a small value, the N value is decreased. When the required HI transmit power is a large value, the N value is increased.

Secondly, the HI symbol is repeatedly transmitted N times according to the number of radio links for the corresponding UE (UE), particularly depending on whether or not soft handover is performed between base stations. In this case, for DP transmission, N DPDCH symbols are punctured. HI is sent to the puncturing DPDCH symbol position. For example, if the number of radio links is large, increase the value of N. If the number of radio links is small, decrease the value of N.

Third, the HI symbol is repeatedly transmitted N times according to the spreading factor of the DPDCH set to the corresponding UE. In this case, for DP transmission, N DPDCH symbols are punctured. HI is sent to the puncturing DPDCH symbol position. For example, the N value is set to a higher value as the spreading factor (hereinafter referred to as SF) is lower. For example, when SF is 256, one symbol HI is transmitted without repetition, and when SF is k, HI is repeatedly transmitted L times. At this time, L is 256 / k. In this case, the k value is one of 128, 64, 32, 16, 8, and 4 values.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments.

Therefore, the above description is not limited to the scope of the invention defined by the limitations of the claims.

As described above, in the conventional scheme, since the HI transmission power is very high in a specific channel environment, it is difficult for the base station to allocate enough power to other channels to transmit when the HI is to be transmitted. When the power is high, it is possible to reduce the burden on the HI power allocation of the base station by using a control information transmission / reception scheme that does not use HI or by reducing the transmission power of HI required by repeatedly transmitting HI symbols.

Claims (18)

A system for transmitting data through a radio section to a receiving end through a channel not dedicated to the receiving end, and transmitting control information for the channel to another channel not dedicated to the receiving end. Checking the status; And determining whether to transmit an indicator indicating that data is transmitted to the non-dedicated channel, which may be transmitted through a channel dedicated to the receiver according to the test result. Method of transmitting control information in a mobile communication system. The method of claim 1, wherein the system is a mobile communication base station, and the receiving end is a mobile communication terminal. The method of claim 1, wherein a data channel dedicated to the receiver is a dedicated physical data channel, a channel not dedicated to the receiver is a downlink shared channel, and another channel not dedicated to the receiver is a downlink shared control channel. Control information transmission method of a wireless mobile communication system. The method of claim 1, wherein the transmission of data transmitted through the undedicated channel is stopped when the indicator is not transmitted. In a system for transmitting data to a receiver that is not dedicated to the receiving end via a radio section, and to transmit control information for the channel to another channel that is not dedicated to the receiving end, a channel dedicated by the receiving end is Evaluating the transmit power of the indicator indicative that data is transmitted on the non-dedicated channel that can be transmitted over; And if the transmit power is greater than a threshold, not transmitting the indicator, and if the transmit power is smaller than a threshold, transmitting the indicator. The method of claim 5, wherein the system is a mobile communication base station, and the receiving end is a mobile communication terminal. 6. The method of claim 5, wherein the data channel dedicated to the receiver is a dedicated physical data channel, the channel not dedicated to the receiver is a downlink shared channel, and the other channel not dedicated to the receiver is a downlink shared control channel. Control information transmission method of a wireless mobile communication system. 6. The method of claim 5, wherein if the indicator is not transmitted, transmission of data transmitted through the undedicated channel is stopped. A system comprising a mobile communication base station transmitting data to a terminal via a wireless section in a channel not dedicated to the terminal and transmitting control information for the channel to another channel not dedicated to the terminal. Transmitting an indicator indicating that data is being transmitted on the non-dedicated channel, which may be transmitted on a channel dedicated to the terminal; Checking whether the terminal communicates data with another base station; If the terminal communicates data with another base station, not transmitting the indicator. 10. The method of claim 9, wherein the data channel dedicated to the terminal is a dedicated physical data channel, the channel not dedicated to the terminal is a downlink shared channel, and the other channel not dedicated to the terminal is a downlink shared control channel. Control information transmission method of a wireless mobile communication system. A system comprising a mobile communication base station transmitting data to a terminal via a wireless section in a channel not dedicated to the terminal and transmitting control information for the channel to another channel not dedicated to the terminal. Not transmitting an indicator indicating that data is being transmitted on the non-dedicated channel, which may be transmitted on a channel dedicated to the terminal; Checking whether the terminal communicates data with another base station; And if the terminal does not communicate data with another base station, sending the indicator to the control information transmission method of the wireless mobile communication system. 12. The method of claim 11, wherein the data channel dedicated to the terminal is a dedicated physical data channel, the channel not dedicated to the terminal is a downlink shared channel, and the other channel not dedicated to the terminal is a downlink shared control channel. Control information transmission method of a wireless mobile communication system. A system for transmitting data through a radio section to a receiving end through a channel not dedicated to the receiving end, and transmitting control information for the channel to another channel not dedicated to the receiving end. Checking the status; And determining whether to repeatedly transmit an indicator indicating that data is transmitted to the non-dedicated channel, which can be transmitted through a channel dedicated to the receiver according to the test result. A control information transmission method of a wireless mobile communication system. The method of claim 13, wherein the system is a mobile communication base station, and the receiving end is a mobile communication terminal. The method of claim 13, wherein a data channel dedicated to the receiver is a dedicated physical data channel, a channel not dedicated to the receiver is a downlink shared channel, and another channel not dedicated to the receiver is a downlink shared control channel. Control information transmission method of a wireless mobile communication system. In a mobile communication terminal receiving data from a transmitter through a radio section to a channel not dedicated to itself, and receiving control information on the channel through another channel not dedicated to the mobile terminal, Determining whether an indicator is transmitted indicating that data is to be transmitted to the non-dedicated channel, which can be transmitted through a channel to which it is dedicated; If the indicator is not transmitted, receiving all of the information transmitted through channels not owned by the control information; And receiving the data in a channel which is not dedicated to the transmission of the data according to the control information indicating the terminal identifier included in the information and instructing itself to control the wireless mobile communication terminal. How to receive information. The method of claim 16, wherein the transmitting end is a mobile communication base station. 17. The method of claim 16, wherein the data channel dedicated to the terminal is a dedicated physical data channel, the channel not dedicated to the terminal is a downlink shared channel, and the other channel not dedicated to the terminal is a downlink shared control channel. Control information receiving method of a wireless mobile communication terminal.