CN103944665B

CN103944665B - Sending method, the device and system of uplink demodulation reference signal

Info

Publication number: CN103944665B
Application number: CN201310020112.9A
Authority: CN
Inventors: 王瑜新; 关艳峰; 孙云锋; 陈艺戬; 李书鹏; 陈宪明; 罗薇
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2013-01-18
Filing date: 2013-01-18
Publication date: 2018-08-21
Anticipated expiration: 2033-01-18
Also published as: WO2014110928A1; CN103944665A

Abstract

The present invention provides a kind of sending method of uplink demodulation reference signal, device and system.It is related to the communications field；Solve the problems, such as that the running time-frequency resource expense of uplink demodulation reference signal is excessive.This method includes：Base station is that user terminal configuration sends uplink demodulation reference signal（DMRS）Required resource or pattern（pattern）Or parameter set, the resource or pattern or parameter set include：Time-domain position, frequency domain position, sub-frame configuration or period redirect mode；The resource sent needed for uplink DMRS or pattern or parameter set are sent or are indicated to user terminal by the base station by the bit field or high-level signaling of Downlink Control Information.Technical solution provided by the invention is suitable for long evolving system, and the uplink DMRS for realizing low running time-frequency resource expense sends mechanism.

Description

Method, device and system for sending uplink demodulation reference signal

Technical Field

The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for transmitting an uplink demodulation reference Signal (DMRS).

Background

The Uplink Physical Channel of a Long Term Evolution (LTE) system includes a Physical Random Access Channel (PRACH), a Physical Uplink Shared Channel (PUSCH), and a Physical Uplink Control Channel (PUCCH). Uplink Scheduling Information (Uplink Scheduling Information) for the PUSCH is transmitted by a base station to a target User Equipment (UE) through a Physical Downlink Control Channel (PDCCH for short). The uplink scheduling information includes: and control information such as resource allocation, modulation and coding scheme, Cyclic Shift (Cyclic Shift) of the DMRS and the like related to the physical uplink shared channel.

In the LTE system, a physical uplink shared channel adopts single antenna port transmission. One system frame (frame) contains 10 subframes (subframes), each containing 2 slots (slots). Fig. 1 is a diagram illustrating a conventional cyclic prefix in a slot according to the related art, and as shown in fig. 1, for a conventional cyclic prefix (normalccp), each slot is composed of 6 data symbols and 1 demodulation reference signal. Fig. 2 is a diagram of an Extended cyclic prefix (Extended cyclic prefix, abbreviated as Extended cp) in one slot according to the related art, where each slot is composed of 5 data symbols and 1 demodulation reference signal.

The demodulation reference signal DM RS is composed of a sequence in the frequency domain, which is a cyclic shift of the reference signal sequence. In order to randomize inter-cell interference, a reference signal Sequence of a demodulation reference signal may implement a Sequence Hopping (Sequence Hopping) or a Sequence Group Hopping (SGH) based on a slot, which may also be referred to as a SGH mode of slot Hopping, according to base station configuration. That is, according to the base station configuration, the demodulation reference signals of a ue on two slots in a subframe are different and vary with the slots in a system frame according to a certain hopping pattern.

The uplink scheduling information is carried in a physical downlink control channel, and is sent to the target ue from the base station in a certain downlink control information format (dciformt). In the LTE system, the formats of downlink control information are divided into the following: DCIformat0, 1A, 1B, 1C, 1D, 2A, 3A, etc., where DCIformat0 includes uplink scheduling information for indicating scheduling of a physical uplink shared channel, PUSCH.

An LTE-Advanced system (LTE-a system for short) is a next-generation evolution system of the LTE system. In the LTE-a system, the physical uplink shared channel may be transmitted through a single antenna port or through multiple antenna ports. Fig. 3 is a schematic diagram of baseband processing at a transmitting end of a physical uplink shared channel in an LTE-a system using multi-antenna port transmission in the related art, and as shown in fig. 3, during multi-antenna port transmission, the LTE-a system supports spatial multiplexing based on one or two Codewords (CW), where each Codeword corresponds to a Transport Block (TB). Fig. 4 is a diagram illustrating uplink codeword to layer mapping of a related art LTE-a system, where, as shown in fig. 4, codewords are further mapped to layers (layers), and each codeword is mapped to one or two layers of data.

LTE-a adopts a Codebook (Codebook) based linear Precoding technique (Precoding), which is a technique that utilizes Channel State Information (CSI) to preprocess signals at a transmitting end to improve the performance of a multi-antenna system. One way for the transmitting end to obtain the CSI is through feedback from the receiving end. In order to reduce the feedback overhead, the common approach is to store the same codebook at the receiving end and the transmitting end. The receiving end selects a proper Precoding Matrix in the codebook according to the current channel condition, and feeds back an Index value (Precoding Matrix Index, PMI for short) of the proper Precoding Matrix in the set to the transmitting end, and the transmitting end finds the Precoding Matrix according to the fed-back Precoding Matrix Index and precodes the transmitted signal. The mathematical model of data precoding is that y is HWs + n, where y is the received signal vector, H is the channel coefficient matrix, W is the precoding matrix, s is the signal vector, and n is the noise vector.

In the LTE-A system, when the physical uplink shared channel adopts multi-antenna port transmission, the DMRS of each layer of data is precoded as same as each layer of data. And the demodulation reference signals of different layer data, including the demodulation reference signals of multi-layer data of the same user equipment in a single-user multiple-input multiple-output system (SU-MIMO) and the demodulation reference signals of multi-layer data of a plurality of user equipments in a multi-user multiple-input multiple-output system (MU-MIMO), are orthogonalized by using different demodulation reference signal Cyclic Shifts (CS) and/or Orthogonal masks (OCC) to distinguish different layer data spatially multiplexed by users or different users. Wherein, the orthogonal mask OCC is [ +1, +1] and [ +1, -1 ], and acts on the demodulation reference signals on two slots (slots) within one Subframe (Subframe).

Currently, in the standard Release established by 3GPP, the LTE standard Release is Release8 (Release 8) and Release9 (Release 9), the LTE-a standard Release is Release10 (Release 10) and Release11 (Release 11), which are abbreviated as Rel-8, Rel-9, Rel-10 and Rel-11, respectively, and the LTE-a standard may also include subsequent releases, such as Rel-12. In the current Rel-11 release, the base station may indicate cyclic shift/OCC information of the demodulation reference signal for the scheduled PUSCH through DCIformat0 and DCIformat4, as shown in table 1.

TABLE 1 Cyclic Shift region of uplink-related DCIformatAnd [ w^(λ)(0) w^(λ)(1)]Mapping table

When orthogonalizing the demodulation reference signals using the orthogonal mask OCC, the base station needs to jointly detect the demodulation reference signals on two slots in one subframe, and thus requires that the demodulation reference signals on two slots in one subframe are the same for one ue. In this case, the SGH scheme of slot hopping in the LTE system cannot be used. However, in order to randomize inter-cell interference as much as possible, an SGH scheme for subframe hopping is proposed in the related art. That is, according to the base station configuration, the demodulation reference signals of a ue in two slots in a subframe are the same, the demodulation reference signals in each subframe in a system frame are different, and the demodulation reference signals vary from subframe to subframe in a system frame according to a certain hopping pattern.

As the demand of users for mobile data services increases, a serious challenge is posed to the transmission capability of a mobile communication network. At present, most of mobile data traffic occurs in Small cells (Small cells), and the proportion will continue to increase, so operators have a strong need for high-rate Small Cell coverage data traffic solutions. The small cell is characterized in that a user is usually a fixed user or a very low-speed mobile user, the delay spread of a wireless channel is small, the environment change of the wireless channel is slow, and in addition, a data service is mainly a service based on an Internet Protocol (IP), so that the requirement on transmission delay is not high, but the requirement on data rate is high. However, the design of the current LTE/LTE-a system can adapt to a scenario where the delay spread ratio is large and the wireless channel changes rapidly, and for uplink data transmission of a small cell, if the transmission method of the current LTE/LTE-a system is used, the problems of low transmission efficiency and excessive DMRS overhead are caused. Therefore, the problem of excessive uplink demodulation reference signal resource overhead exists in the prior art.

Disclosure of Invention

The invention provides a method, a device and a system for sending an uplink demodulation reference signal, which solve the problem of overlarge time-frequency resource overhead of the uplink demodulation reference signal.

A method for transmitting an uplink demodulation reference signal includes:

a base station configures resources or patterns (patterns) or parameter sets required by sending uplink DMRS for a user terminal, wherein the resources or patterns or parameter sets comprise:

time domain position, frequency domain position, subframe configuration or cycle, and skip mode;

and the base station transmits or indicates the resources or patterns or parameter sets required by the transmission of the uplink DMRS to the user terminal through the bit field or high layer signaling of the downlink control information.

Preferably, when the downlink control information schedules the user terminal on M consecutive subframes, the time domain position of the uplink DMRS specifically is:

the DMRS is on the 1 st subframe and/or the last 1 subframe and/or the ceil (M/2) th subframe and/or the ceil (M/2) +1 subframe of the M subframes, wherein M is an integer, and ceil () represents rounding up.

Preferably, when the length of the cyclic prefix of the uplink symbol is a common length, the time domain position specifically is:

a 4 th Orthogonal Frequency Division Multiplexing (OFDM) symbol of a 1 st slot and/or a 2 nd slot of a subframe containing the uplink DMRS, or,

the method includes the steps that the 7 th OFDM symbol of the 1 st slot of the subframe containing the uplink DMRS or the 1 st OFDM symbol of the 2 nd slot of the subframe.

Preferably, when the length of the cyclic prefix of the uplink symbol is an extended length, the time domain position specifically is:

a 3 rd OFDM symbol of a 1 st slot and/or a 2 nd slot of a subframe containing the uplink DMRS, or,

the method includes the steps that the first OFDM symbol of the 1 st slot of the subframe containing the uplink DMRS or the 1 st OFDM symbol of the 2 nd slot of the subframe.

Preferably, the frequency domain locations include:

and all subcarriers or part of subcarriers of a bandwidth of a Physical Uplink Shared Channel (PUSCH) at a time domain position of an uplink DMRS of the user terminal.

Preferably, the subframe configuration or period includes:

the method comprises the steps of subframe configuration indexes of an uplink DMRS, the period of the uplink DMRS and subframe offset of the uplink DMRS.

Preferably, the jumping manner includes:

on a subframe n, the uplink DMRS sequence of the user terminal occupies the subcarrier of the upper half bandwidth or the subcarrier of the lower half bandwidth of the PUSCH bandwidth, wherein n is an integer,

on a subframe n +1, the uplink DMRS sequence of the user terminal occupies the subcarrier of the lower half bandwidth or the subcarrier of the upper half bandwidth of the PUSCH bandwidth,

and on the subframe n +2, the uplink DMRS sequence of the user terminal occupies the subcarrier of the upper half bandwidth or the subcarrier of the lower half bandwidth of the PUSCH bandwidth and sequentially and circularly skips.

Preferably, the jumping manner includes:

in the 1 st time slot of a subframe n, the uplink DMRS sequence of the user terminal occupies the subcarrier of the upper half bandwidth or the subcarrier of the lower half bandwidth of the PUSCH bandwidth, wherein n is an integer,

in the 2 nd time slot of the subframe n, the uplink DMRS sequence of the user terminal occupies the subcarrier of the lower half bandwidth or the subcarrier of the upper half bandwidth of the PUSCH bandwidth,

the configuration mode on the subframe n +1 is the same as the subframe n, and the cyclic skip is performed in sequence.

Preferably, the sending or indicating, by the base station through the bit field of the downlink control information or the high layer signaling, the resource or the pattern or the parameter set required for sending the uplink DMRS to the user terminal specifically includes:

the base station configures at least one resource or pattern or parameter set required by transmitting the uplink DMRS for the user terminal through high-level signaling, and selects 1 of the at least one resource or pattern or parameter set through a bit field in downlink control information.

Preferably, the downlink control information includes downlink control information for scheduling a PUSCH or for scheduling a Physical Downlink Shared Channel (PDSCH) or downlink control information for scheduling a user terminal of a small cell (small cell).

Preferably, the bit field in the downlink control information includes:

a Carrier indicator (Carrier indicator) bit field, or a cyclic shift and OCC index bit field of the DMRS, or a bit field for indicating a period or subframe configuration or subframe offset or pattern of the DMRS, or a bit field for indicating the number of subframes for continuous scheduling.

Preferably, the bit field for indicating the period or subframe configuration or subframe offset or pattern of the uplink DMRS and the bit field for indicating the number of subframes for continuous scheduling are carried in a DCI Format field dedicated to a user, or are carried in a DCIFormat field dedicated to a user terminal carrying a small cell for scheduling.

Preferably, when the uplink DMRS occupies two time domain OFDM symbols within one subframe and the uplink DMRS sequence occupies frequency domain positions with the same bandwidth, the two DMRS symbols are time domain spread using orthogonal masking (OCC).

Preferably, the time domain spreading of the two DMRS symbols by using the OCC specifically includes:

when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies frequency domain positions with different bandwidths, the OCC is used for carrying out time domain expansion on the 1 st DMRS symbol of the subframe n and the 1 st DMRS symbol of the subframe n +1, and the OCC is used for carrying out time domain expansion on the 2 nd DMRS symbol of the subframe n and the 2 nd DMRS symbol of the subframe n + 1.

The invention also provides a method for sending the uplink demodulation reference signal, which comprises the following steps:

a user terminal receives a bit field or a high layer signaling of downlink control information which is sent by a base station and used for configuring resources or patterns or parameter sets required by an uplink DMRS, wherein the resources or patterns or parameter sets comprise:

and the user terminal sends the uplink DMRS according to the resource or the pattern or the parameter set required by the uplink DMRS configured by the base station.

a 4 th OFDM symbol of a 1 st slot and/or a 2 nd slot of a subframe containing the uplink DMRS, or,

Preferably, the frequency domain locations include:

and all subcarriers or part of subcarriers of the bandwidth of the PUSCH at the time domain position of the uplink DMRS of the user terminal.

Preferably, the subframe configuration or period includes:

Preferably, the jumping manner includes:

Preferably, when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies a frequency domain position with the same bandwidth, the OCC is used to perform time domain spreading on the two DMRS symbols.

Preferably, the downlink control information includes downlink control information for scheduling a PUSCH or for scheduling a PDSCH or downlink control information for scheduling a user terminal of a small cell.

Preferably, the bit field in the downlink control information includes:

a carrier indication bit field, or a cyclic shift and OCC index bit field of the DMRS, or a bit field for indicating a period or subframe configuration or subframe offset or pattern of the DMRS, or a bit field for indicating a number of subframes for continuous scheduling.

The invention also provides a sending device of the uplink demodulation reference signal, which comprises the following components:

a configuration module, configured to configure, for a user equipment, a resource or a pattern or a parameter set required for transmitting an uplink DMRS, where the resource or the pattern or the parameter set includes:

and the indicating module is used for transmitting or indicating the resources or the patterns or the parameter sets required by the transmission of the uplink DMRS to the user terminal through downlink control information or high-level signaling.

Preferably, the apparatus for transmitting an uplink demodulation reference signal includes:

a configuration receiving module, configured to receive downlink control information or a high-level signaling, sent by a base station, for configuring a resource or a pattern or a parameter set required by an uplink DMRS, where the resource or the pattern or the parameter set includes:

and the signal sending module is used for sending the uplink DMRS according to the resource or the pattern or the parameter set required by the uplink DMRS configured by the base station.

The invention also provides a system for sending the uplink demodulation reference signal, which comprises a base station and the user equipment below the base station;

the base station is configured to configure, for the user terminal, a resource or a pattern or a parameter set required for transmitting the uplink DMRS, and transmit or indicate, to the user terminal, the resource or the pattern or the parameter set required for transmitting the uplink DMRS through a bit field or a higher layer signaling of downlink control information, where the resource or the pattern or the parameter set includes:

and the user terminal is used for receiving downlink control information or high-level signaling which is sent by the base station and used for configuring the resource or pattern or parameter set required by the uplink DMRS, and sending the uplink DMRS according to the resource or pattern or parameter set required by the uplink DMRS configured by the base station.

Preferably, the frequency domain locations include:

Preferably, the subframe configuration or period includes:

Preferably, the jumping manner includes:

Preferably, the sending, by the base station, the resource or pattern or parameter set required for sending the uplink DMRS to the user terminal through the downlink control information or the high-level signaling indication specifically includes:

the base station configures at least one resource or pattern or parameter set required by transmitting the uplink DMRS for the user terminal through a high-level signaling, and selects 1 of the at least one resource or pattern or parameter set through a bit field in downlink control information.

Preferably, the bit field in the downlink control information includes:

The invention provides a method, a device and a system for sending an uplink demodulation reference signal, wherein a base station configures resources or patterns or parameter sets required by sending an uplink DMRS for a user terminal, and sends or indicates the resources or patterns or parameter sets required by sending the uplink DMRS to the user terminal through downlink control information or high-level signaling, and the resources or patterns or parameter sets comprise: time domain position, frequency domain position, subframe configuration or cycle, and skip mode; and the user terminal receives downlink control information or high-level signaling which is sent by the base station and used for configuring the resource or pattern or parameter set required by the uplink DMRS, and sends the uplink DMRS according to the resource or pattern or parameter set required by the uplink DMRS configured by the base station. The technical scheme provided by the invention realizes an uplink DMRS transmission mechanism with low time-frequency resource overhead and solves the problem of overlarge time-frequency resource overhead of the uplink demodulation reference signal.

Drawings

FIG. 1 is a diagram of a conventional cyclic prefix in a slot of the prior art;

FIG. 2 is a diagram of an extended cyclic prefix in a slot of the prior art;

fig. 3 is a schematic diagram of a transmitting end baseband signal processing of a physical uplink shared channel transmitted by using multiple antenna ports in an LTE-a system in the prior art;

FIG. 4 is a diagram illustrating uplink codeword to layer mapping of an LTE-A system in the prior art;

fig. 5 is a flowchart of a method for transmitting an uplink demodulation reference signal according to a first embodiment of the present invention;

fig. 6 is a schematic diagram 1 of time-frequency positions for placing uplink DMRS sequences;

fig. 7 is a schematic diagram 2 of time-frequency positions for placing uplink DMRS sequences;

fig. 8 is a schematic diagram 1 of a hopping pattern of an uplink DMRS;

fig. 9 is a schematic diagram 2 of a hopping pattern of an uplink DMRS;

fig. 10 is a schematic structural diagram of a transmitting apparatus for uplink demodulation reference signals according to a third embodiment of the present invention;

fig. 11 is a schematic structural diagram of another uplink demodulation reference signal transmitting apparatus according to a third embodiment of the present invention.

Detailed Description

To further enhance urban outdoor scenes using low power nodes, Small cells have been identified as the subject of Rel-12 focused research. Small cells belong to nodes with low transmitting power, the cell radius is generally smaller, and the scene of low-speed UE is mainly considered. In a low-speed scenario, in order to improve uplink throughput, reducing time-frequency resource overhead of an uplink DMRS may be considered. How to reduce the overhead is a problem to be solved.

Aiming at the problem of excessive time-frequency resource overhead of uplink DMRS in the related technology, no effective solution is provided at present.

In order to solve the above problem, embodiments of the present invention provide a method, an apparatus, and a system for transmitting an uplink demodulation reference signal.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

Preferred embodiment 1

First, a first embodiment of the present invention will be described with reference to the drawings.

An embodiment of the present invention provides a method for sending an uplink demodulation reference signal, where a process of sending the uplink demodulation reference signal by using the method is shown in fig. 5, and the process includes:

step 501, a base station configures resources or patterns or parameter sets required by sending uplink DMRS for a user terminal;

in this step, the resource or pattern (pattern) or parameter set includes: time domain position, frequency domain position, hopping (hopping) mode.

Wherein the time domain positions comprise:

when the length of the cyclic prefix of the uplink symbol is a common length, the time domain position specifically is as follows: a 4 th OFDM symbol of a 1 st slot and/or a 2 nd slot of a subframe containing the uplink DMRS; or, the 7 th OFDM symbol of the 1 st slot of the subframe containing the uplink DMRS or the 1 st OFDM symbol of the 2 nd slot of the subframe;

when the length of the cyclic prefix of the uplink symbol is an extended length, the time domain position specifically is as follows: a 3 rd OFDM symbol of a 1 st slot and/or a 2 nd slot of a subframe containing the uplink DMRS; or, the 6 th OFDM symbol of the 1 st slot of the subframe or the 1 st OFDM symbol of the 2 nd slot of the subframe containing the uplink DMRS.

The frequency domain locations include: and all subcarriers or part of subcarriers of the bandwidth of the PUSCH at the time domain position of the uplink DMRS of the user terminal. For example, the subcarriers of the upper half bandwidth or the subcarriers of the lower half bandwidth of the PUSCH bandwidth are, for example, as shown in fig. 6 or fig. 7, when the length of the uplink symbol cyclic prefix is a normal length.

The skipping mode comprises the following steps:

on a subframe n, an uplink DMRS sequence of the user terminal occupies a subcarrier of the upper half bandwidth or a subcarrier of the lower half bandwidth of a PUSCH bandwidth; on a subframe n +1, the uplink DMRS sequence of the user terminal occupies a subcarrier of the lower half bandwidth or a subcarrier of the upper half bandwidth of the PUSCH bandwidth; in the subframe n +2, the uplink DMRS sequence of the user terminal occupies the subcarriers of the upper half bandwidth or the subcarriers of the lower half bandwidth of the PUSCH bandwidth, and cyclically jumps in sequence, as shown in fig. 8.

In the 1 st time slot of the subframe n, the uplink DMRS sequence of the user terminal occupies the subcarrier of the upper half bandwidth or the subcarrier of the lower half bandwidth of the PUSCH bandwidth; in the 2 nd time slot of the subframe n, the uplink DMRS sequence of the user terminal occupies the subcarrier of the lower half bandwidth or the subcarrier of the upper half bandwidth of the PUSCH bandwidth; the configuration on the subframe n +1 is the same as the subframe n, and the cyclic hopping is performed sequentially, as shown in fig. 9.

Preferably, when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies frequency domain positions with different bandwidths, the OCC is used to perform time domain spreading on the 1 st DMRS symbol of the subframe n and the 1 st DMRS symbol of the subframe n +1, and the OCC is used to perform time domain spreading on the 2 nd DMRS symbol of the subframe n and the 2 nd DMRS symbol of the subframe n + 1.

Step 502, the base station sends or indicates the resource or pattern or parameter set required by sending the uplink DMRS to the user terminal through the bit field of the downlink control information or the high layer signaling;

in this step, specifically, the base station configures, for the user equipment, at least one resource or pattern or parameter set required for transmitting the uplink DMRS through a high-level signaling, and selects 1 of the at least one resource or pattern or parameter set through a bit field in the downlink control information.

Preferably, the downlink control information includes downlink control information for scheduling a PUSCH or a PDSCH.

Step 503, the user terminal receives downlink control information or a higher layer signaling sent by the base station and used for configuring the resource or pattern or parameter set required by the uplink DMRS.

And step 504, the user terminal sends the uplink DMRS according to the resource or the pattern or the parameter set required by the uplink DMRS configured by the base station.

Preferred embodiment two

The second embodiment of the present invention will be described below with reference to the drawings.

The base station configures subframe configuration or period of the uplink DMRS for the user terminal through high-level signaling, as shown in table 2, table 3 or table 4 below. When the uplink DMRS subframe configuration index in table 2 is 0, the period is 0.5, which indicates that there are 2 DMRS time domain symbols in one subframe, and the time domain symbol position is the same as the uplink DMRS time domain symbol position in the Rel-8/9/10/11 standard, and is intended for a UE that is backward compatible with Rel-8/9/10/11. When the uplink DMRS subframe configuration index is 1, only one uplink DMRS time domain symbol is shown in one subframe; when the subframe configuration index is 2, the period of the uplink DMRS is 2, the offset is 0, the 1 st subframe in the period has the DMRS, and the 2 nd subframe does not have the DMRS; the other subframe configuration indices of table 1 may be analogized. The time domain positions within a subframe include:

when the length of the cyclic prefix of the uplink symbol is a common length, the time domain position specifically is as follows: a 4 th OFDM symbol of a 1 st slot or a 2 nd slot of a subframe; or, the 7 th OFDM symbol of the 1 st slot of the subframe or the 1 st OFDM symbol of the 2 nd slot of the subframe

When the length of the cyclic prefix of the uplink symbol is an extended length, the time domain position specifically is as follows: a 3 rd OFDM symbol of a 1 st slot or a 2 nd slot of a subframe; or, the 6 th OFDM symbol of the 1 st slot of the subframe or the 1 st OFDM symbol of the 2 nd slot of the subframe.

For tables 3 and 4, the 2 DMRS time domain symbols in the subframe are considered as a group, and the time-frequency position of the DMRS in the subframe is the same as the uplink DMRS of Rel-8/9/10/11. When the subframe configuration index is 0, the UE which is backward compatible with Rel-8/9/10/11 can be obtained. When the index is 1, the corresponding period is 2 and the subframe configuration offset is 0, which means that 2 subframes are used as the period, a group of uplink DMRSs exists in the 1 st subframe, and the group of uplink DMRSs does not exist in the 2 nd subframe. Other subframe configuration indices may be analogized.

TABLE 2 subframe configuration for uplink DMRS

TABLE 3 subframe configuration for uplink DMRS

TABLE 4 subframe configuration for uplink DMRS

It should be noted that, in the specific implementation, the expansion may be performed according to the configuration rule of table 2, table 3, or table 4, or a part of the configuration may be selected to generate a new subframe configuration table.

And the user terminal receives the high-level signaling sent by the base station and sends the uplink DMRS according to the configuration.

Preferred embodiment three

The base station configures at least one resource or pattern or parameter set required by transmitting the uplink DMRS for the user terminal through high-level signaling, and selects 1 of the at least one resource or pattern or parameter set through a bit field in the downlink control information.

Taking a user terminal as an example for explanation, two DMRS patterns are configured for the UE, wherein the first pattern is the same as the uplink DMRS pattern of Rel-8/9/10/11, and the purpose is to place uplink DMRS sequences on all subcarriers of the 4 th OFDM symbol of each time slot of a subframe when backward compatibility with low-version UE, namely, normal CP, and place uplink DMRS sequences on all subcarriers of the 3 rd OFDM symbol of each time slot of the subframe when CP is extended; the second pattern is an uplink DMRS pattern configured for a small cell or NCT, the uplink DMRS is configured by combining an uplink DMRS subframe configuration (as shown in table 2) configured by high-level signaling, and the time domain position for transmitting the DMRS includes:

The bit field in the downlink control information comprises: a Carrier indicator (Carrier indicator) bit field, or a cyclic shift and OCC index bit field of the DMRS, or a bit field for indicating a period or subframe configuration or subframe offset or pattern of the DMRS, or a bit field for indicating the number of subframes for continuous scheduling.

And the user terminal receives the downlink control information and/or the high-level signaling sent by the base station and sends the uplink DMRS according to the configuration.

Preferred embodiment four

The embodiment of the invention provides a method for sending an uplink demodulation reference signal, wherein the related user equipment is specifically UE, a base station configures the sending period and/or subframe offset of an uplink DMRS for the UE, and the sending period and/or subframe offset is indicated to the UE through a bit field of downlink control information, as shown in table 5, table 6 or table 7.

Taking table 5 as an example, when the value of the bit field is '00', it indicates that the uplink DMRS period is 1, each uplink subframe has 2 uplink DMRS time domain OFDM symbols, and the time domain position and the frequency domain position are the same as those specified by the Rel-8/9/10/11 standard; when the value of the bit field is '01', the period of the uplink DMRS is 2, if the subframe offset is 0, the 1 st subframe in the period contains 2 or 1 uplink DMRS time domain OFDM symbols, and the 2 nd subframe in the period does not have the uplink DMRS time domain OFDM symbols. For the uplink DMRS of the 1 st subframe, the specific time domain positions include:

when the length of the cyclic prefix of the uplink symbol is a common length, the time domain position specifically is as follows: a 4 th OFDM symbol of a 1 st slot and/or a 2 nd slot of a subframe; or, the 7 th OFDM symbol of the 1 st slot of the subframe or the 1 st OFDM symbol of the 2 nd slot of the subframe;

when the length of the cyclic prefix of the uplink symbol is an extended length, the time domain position specifically is as follows: a 1 st slot and/or a 3 rd OFDM symbol of a 2 nd slot of a subframe; or, the 6 th OFDM symbol of the 1 st slot of the subframe or the 1 st OFDM symbol of the 2 nd slot of the subframe.

The frequency domain locations include: and all subcarriers or part of subcarriers of the bandwidth of the PUSCH at the time domain position of the uplink DMRS of the user terminal.

When the value of the bit field is '10' or '11', and so on. Tables 6 and 7 are extended to 3 bits on the basis of table 5 to indicate the period of the uplink DMRS, and the indication manner may be similar to that of table 5.

Preferably, the downlink control information includes: the downlink control information is used for scheduling a Physical Uplink Shared Channel (PUSCH), scheduling a Physical Downlink Shared Channel (PDSCH) and scheduling a small cell.

Preferably, the bit field in the downlink control information includes: a Carrier indicator (Carrier indicator) bit field, or a cyclic shift and OCC index bit field of the DMRS, or a bit field for indicating a period or subframe configuration or subframe offset or pattern of the DMRS, or a bit field for indicating the number of subframes for continuous scheduling.

TABLE 5 periodicity/subframe offset indication for uplink DMRS

TABLE 6 periodicity/subframe offset indication for uplink DMRS

TABLE 7 periodicity/subframe offset indication for uplink DMRS

Preferably, the bit field for indicating the period or subframe configuration or subframe offset or pattern of the uplink DMRS or the bit field for indicating the number of subframes for continuous scheduling is carried in a DCI Format field dedicated to a user, or is carried in a DCIFormat field dedicated to a user terminal carrying a small cell for scheduling.

And the user terminal sends the uplink DMRS according to the configuration.

Preferred embodiment five

The base station configures resources or patterns or parameter sets required by sending the uplink demodulation reference signals for the user terminal, wherein the resources or patterns or parameter sets comprise:

Preferably, the bit field of the downlink control information indicates the number of consecutive subframes (denoted as M) for scheduling the ue by the downlink control information, as shown in table 8, table 9, or table 10:

TABLE 8 subframe number indication for continuous scheduling

TABLE 9 subframe number indication for continuous scheduling

TABLE 10 indication of number of subframes scheduled consecutively

The time domain position of the uplink DMRS is specifically as follows:

Preferably, the bit field for indicating the number of subframes for continuous scheduling is carried in a user-specific DCIFormat field, or is carried in a DCIFormat field dedicated to a user terminal carrying a small cell for scheduling.

And the user terminal sends the uplink DMRS according to the configuration.

Preferred embodiment six

An embodiment of the present invention provides a device for sending an uplink demodulation reference signal, where the structure of the device is shown in fig. 10, and the device includes:

a configuration module 1001, configured to configure, for a user equipment, a resource, a pattern, or a parameter set required for transmitting an uplink DMRS, where the resource, the pattern, or the parameter set includes:

an indicating module 1002, configured to send or indicate the resource, the pattern, or the parameter set required for sending the uplink DMRS to the user terminal through downlink control information or a higher layer signaling.

The apparatus for transmitting uplink demodulation reference signals shown in fig. 10 may be integrated in a base station, and the base station performs corresponding functions.

An embodiment of the present invention further provides a device for sending an uplink demodulation reference signal, where the structure of the device is shown in fig. 11, and the device includes:

a configuration receiving module 1101, configured to receive downlink control information or higher layer signaling sent by a base station and used to configure a resource, a pattern, or a parameter set required by an uplink DMRS, where the resource, the pattern, or the parameter set includes:

a signal sending module 1102, configured to send the uplink DMRS according to the resource, the pattern, or the parameter set required by the uplink DMRS configured by the base station.

The apparatus for transmitting uplink demodulation reference signals shown in fig. 11 may be integrated in a user equipment, and the user equipment performs corresponding functions.

The embodiment of the present invention further provides a system for sending an uplink demodulation reference signal, including a base station and user equipment below the base station, where the base station includes a sending apparatus for the uplink demodulation reference signal shown in fig. 10, and the user equipment includes a sending apparatus for the uplink demodulation reference signal shown in fig. 11;

the base station is configured to configure, for the user terminal, a resource or a pattern or a parameter set required for transmitting the uplink DMRS, and transmit or indicate, to the user terminal, the resource or the pattern or the parameter set required for transmitting the uplink DMRS through downlink control information or a high-level signaling, where the resource or the pattern or the parameter set includes:

Preferably, the frequency domain locations include:

Preferably, the subframe configuration or period includes:

Preferably, the jumping manner includes:

Preferably, the bit field in the downlink control information includes:

The embodiment of the invention provides a method, a device and a system for sending an uplink demodulation reference signal, wherein a base station configures resources or patterns or parameter sets required by sending an uplink DMRS for a user terminal, and sends the resources or patterns or parameter sets required by sending the uplink DMRS to the user terminal through downlink control information or high-level signaling indication, and the resources or patterns or parameter sets comprise: time domain position, frequency domain position, subframe configuration or cycle, and skip mode; and the user terminal receives downlink control information or high-level signaling which is sent by the base station and used for configuring the resource or pattern or parameter set required by the uplink DMRS, and sends the uplink DMRS according to the resource or pattern or parameter set required by the uplink DMRS configured by the base station. The technical scheme provided by the invention realizes an uplink DMRS transmission mechanism with low time-frequency resource overhead and solves the problem of overlarge time-frequency resource overhead of the uplink demodulation reference signal. In the embodiment of the invention, the base station configures a plurality of uplink DMRS resources or patterns or parameter sets for the user terminal through the downlink control information or the high-level signaling, and dynamically selects one of the plurality of resources or patterns or parameter sets through the downlink control information, so that the base station can dynamically configure the uplink DMRS for the UE according to the scene of the UE, thereby saving the overhead of the uplink DMRS and improving the transmission performance of the system.

It will be understood by those of ordinary skill in the art that all or part of the steps of the above embodiments may be implemented using a computer program flow, which may be stored in a computer readable storage medium and executed on a corresponding hardware platform (e.g., system, apparatus, device, etc.), and when executed, includes one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may be implemented by using an integrated circuit, and the steps may be respectively manufactured as an integrated circuit module, or a plurality of the blocks or steps may be manufactured as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The devices/functional modules/functional units in the above embodiments may be implemented by general-purpose computing devices, and they may be centralized on a single computing device or distributed on a network formed by a plurality of computing devices.

Each device/function module/function unit in the above embodiments may be implemented in the form of a software function module and may be stored in a computer-readable storage medium when being sold or used as a separate product. The computer readable storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc.

Any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all such changes or substitutions are included in the scope of the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for transmitting an uplink demodulation reference signal (DM-RS), comprising:

a base station configures resources or patterns or parameter sets required by sending an uplink demodulation reference signal (DMRS) for a user terminal, wherein the resources or patterns or parameter sets comprise:

the base station transmits or indicates the resources or patterns or parameter sets required by the transmission of the uplink DMRS to the user terminal through the bit field or high layer signaling of the downlink control information;

wherein, the bit field in the downlink control information comprises:

a Carrier indicates a Carrier indicator bit field, or a cyclic shift and orthogonal mask OCC index bit field of a DMRS, or a bit field for indicating a period or subframe configuration or subframe offset or pattern of the DMRS, or a bit field for indicating a number of subframes for continuous scheduling;

the skipping mode comprises the following steps:

on the subframe n +2, the uplink DMRS sequence of the user terminal occupies the subcarrier of the upper half bandwidth or the subcarrier of the lower half bandwidth of the PUSCH bandwidth, and the cyclic skip is carried out in sequence;

or,

2. The method according to claim 1, wherein when the downlink control information schedules the user terminal on M consecutive subframes, the time domain position of the uplink DMRS is specifically:

3. The method according to claim 1 or 2, wherein when the length of the cyclic prefix of the uplink symbol is a normal length, the time domain position specifically is:

a 4 th orthogonal frequency division multiplexing, OFDM, symbol of a 1 st slot and/or a 2 nd slot of a subframe containing the uplink DMRS, or,

4. The method according to claim 1 or 2, wherein when the length of the cyclic prefix of the uplink symbol is an extended length, the time domain position specifically is:

5. The method according to claim 1, wherein the frequency domain position comprises:

and all subcarriers or part of subcarriers of the bandwidth of the physical uplink shared channel PUSCH at the time domain position of the uplink DMRS of the user terminal.

6. The method according to claim 1, wherein the subframe configuration or periodicity comprises:

7. The method for transmitting the uplink demodulation reference signal according to claim 1, wherein the step of the base station transmitting or indicating the resource or the pattern or the parameter set required for transmitting the uplink DMRS to the user terminal through the bit field of the downlink control information or the higher layer signaling specifically includes:

8. The method according to claim 1 or 7, wherein the downlink control information comprises downlink control information for scheduling a PUSCH or for scheduling a Physical Downlink Shared Channel (PDSCH) or downlink control information for scheduling a user terminal of a small cell.

9. The method according to claim 1, wherein the uplink demodulation reference signal comprises a plurality of demodulation reference signals,

the bit field for indicating the period or subframe configuration or subframe offset or pattern of the uplink DMRS and the bit field for indicating the number of the subframes for continuous scheduling are carried in a DCI Format field special for users or carried in a DCI Format field special for carrying user terminals of small cells for scheduling.

10. The method according to claim 1, wherein the uplink demodulation reference signal comprises:

and when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies the frequency domain position with the same bandwidth, performing time domain expansion on the two DMRS symbols by using the orthogonal mask OCC.

11. The method for transmitting the uplink demodulation reference signal according to claim 10, wherein the time domain spreading the two DMRS symbols using the OCC specifically comprises:

12. A method for transmitting an uplink demodulation reference signal (DM-RS), comprising:

a user terminal receives a bit field or high layer signaling of downlink control information which is sent by a base station and used for configuring resources or patterns or parameter sets required by an uplink demodulation reference signal (DMRS), wherein the resources or patterns or parameter sets comprise:

the user terminal sends the uplink DMRS according to the resource or pattern or parameter set required by the uplink DMRS configured by the base station;

the bit field in the downlink control information comprises:

a carrier indication bit field, or a cyclic shift and orthogonal mask OCC index bit field of the DMRS, or a bit field for indicating a period or subframe configuration or subframe offset or pattern of the DMRS, or a bit field for indicating a number of subframes for continuous scheduling;

the skipping mode comprises the following steps:

or,

13. The method for transmitting the uplink demodulation reference signal according to claim 12, wherein when the downlink control information schedules the user terminal on M consecutive subframes, the time domain position of the uplink DMRS is specifically:

14. The method of claim 12 or 13, wherein when the length of the cyclic prefix of the uplink symbol is a normal length, the time domain position specifically is:

15. The method of claim 12 or 13, wherein when the length of the cyclic prefix of the uplink symbol is an extended length, the time domain position is specifically:

16. The method according to claim 12, wherein the frequency domain position comprises:

17. The method according to claim 12, wherein the subframe configuration or period comprises:

18. The method according to claim 12, wherein the uplink demodulation reference signal comprises:

and when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies the frequency domain position with the same bandwidth, performing time domain expansion on the two DMRS symbols by using the OCC.

19. The method for transmitting the uplink demodulation reference signal according to claim 18, wherein the time domain spreading the two DMRS symbols using the OCC specifically comprises:

20. The method of claim 12, wherein the downlink control information comprises downlink control information for scheduling a PUSCH or a PDSCH or downlink control information for scheduling a user terminal of a small cell.

21. The method according to claim 12, wherein the uplink demodulation reference signal comprises a plurality of demodulation reference signals,

22. An apparatus for transmitting an uplink demodulation reference signal, comprising:

a configuration module, configured to configure, for a user equipment, a resource, a pattern, or a parameter set required for sending an uplink demodulation reference signal DMRS, where the resource, the pattern, or the parameter set includes:

an indication module, configured to send or indicate the resource or pattern or parameter set required for sending the uplink DMRS to a user terminal through downlink control information or a high-level signaling;

wherein, the bit field in the downlink control information comprises:

the skipping mode comprises the following steps:

or,

23. An apparatus for transmitting an uplink demodulation reference signal, comprising:

a configuration receiving module, configured to receive downlink control information or a high-level signaling, sent by a base station, for configuring a resource, a pattern, or a parameter set required by a DMRS for uplink demodulation reference signal, where the resource, the pattern, or the parameter set includes:

a signal transmitting module, configured to transmit the uplink DMRS according to the resource, pattern, or parameter set required by the uplink DMRS configured by the base station;

wherein, the bit field in the downlink control information comprises:

the skipping mode comprises the following steps:

on a subframe n, an uplink DMRS sequence of a user terminal occupies a subcarrier of the upper half bandwidth or a subcarrier of the lower half bandwidth of a PUSCH bandwidth, wherein n is an integer,

or,

24. A transmission system of an uplink demodulation reference signal is characterized by comprising a base station and user equipment below the base station;

the base station is configured to configure, for the user terminal, a resource, a pattern, or a parameter set required for sending an uplink demodulation reference signal DMRS, and send or indicate the resource, the pattern, or the parameter set required for sending the uplink DMRS to the user terminal through a bit field or a higher layer signaling of downlink control information, where the resource, the pattern, or the parameter set includes:

the user terminal is used for receiving downlink control information or high-level signaling which is sent by the base station and used for configuring resources or patterns or parameter sets required by the uplink DMRS, and sending the uplink DMRS according to the resources or patterns or parameter sets required by the uplink DMRS configured by the base station;

wherein, the bit field in the downlink control information comprises:

the skipping mode comprises the following steps:

or,

25. The system for transmitting an uplink demodulation reference signal according to claim 24, wherein when the downlink control information schedules the user terminal on M consecutive subframes, the time domain position of the uplink DMRS is specifically:

26. The system for sending an uplink demodulation reference signal according to claim 24 or 25, wherein when the length of the cyclic prefix of the uplink symbol is a normal length, the time domain position specifically is:

27. The system for sending an uplink demodulation reference signal according to claim 24 or 25, wherein when the length of the cyclic prefix of the uplink symbol is an extended length, the time domain position specifically is:

28. The system for transmitting uplink demodulation reference signals according to claim 24, wherein the frequency domain locations comprise:

29. The system for transmitting uplink demodulation reference signals according to claim 24, wherein the subframe configuration or period comprises:

30. The system for sending the uplink demodulation reference signal according to claim 24, wherein the step of sending, by the base station, the resource or pattern or parameter set required for sending the uplink DMRS to the user terminal through the downlink control information or the higher layer signaling specifically includes:

31. The system for transmitting uplink demodulation reference signals according to claim 24 or 30, wherein the downlink control information comprises downlink control information for scheduling PUSCH or scheduling PDSCH or downlink control information for scheduling user terminals of small cells.

32. The system for transmitting an uplink demodulation reference signal according to claim 24,