CN102711263B - Multiuser uplink control signal sending method in non-continuous receiving mode - Google Patents

Abstract

The invention discloses a method for sending multi-user uplink control signals in a discontinuous reception mode, comprising the following steps: S1: dividing all intelligent terminal user equipment in a cell into several intelligent terminal groups; S2: taking the intelligent terminal group as a unit of Each intelligent terminal user equipment belonging to the same intelligent terminal group allocates group public resources used only during the discontinuous reception activation period of each intelligent terminal user equipment; S3: each intelligent terminal user equipment is sequentially in its respective discontinuous reception activation period Occupy the group common resources of the smart terminal group to which it belongs, and send uplink control signals. The present invention overcomes the bottleneck of uplink control resources and reduces the waste of uplink control resources.

Description

A method for sending multi-user uplink control signals in discontinuous reception mode

technical field

The invention relates to the technical field of wireless communication, in particular to a method for sending multi-user uplink control signals in a discontinuous reception mode.

Background technique

With the continuous development of mobile Internet services, the number of users using instant messaging (IM, Instant Message) services through mobile communication networks continues to increase. In China, Tencent's QQ business accounts for the vast majority of IM business. According to the official statistics of Tencent, there are currently 200 million smart phone QQ registered users, including 100 million active users, and 20 million online users at the same time. challenge. In the Long Term Evolution (LTE, Long Term Evolution) system, providing high-efficiency and high-quality-of-service support for IM services is an important research work for R11 standardization. In May 2011, the 74th meeting of 3GPP RAN2 (3rd Generation Partnership Project Radio Access Network2) launched a new research project: Diverse Data Applications.

LTE TS 36.321 stipulates that the user equipment (UE, User Equipment) in the silent period of discontinuous reception (DRX, Discontinuous Reception) does not need to send a scheduling request (SR, Schedule Request), nor does it need to perform channel state information (CSI, Channel State Information ) report, and there is no need to send an uplink Sounding Reference Signal (SRS, Sounding Reference Signal). Therefore, semi-statically allocated uplink control resources, such as physical uplink control channel (PUCCH, PhysicalUplink Control CHannel) resources and SRS resources that carry SR and CSI (including channel quality indicator CQI, precoding matrix indicator and rank indicator RI) and SRS resources The DRX silent period overlaps and is wasted, as shown in FIG. 1 . Proposal R2-112171 submitted by British RIM company pointed out that when there are a large number (2000-5000) of SmartPhone UEs that are always online (always on line) in the LTE system, such resource waste is particularly serious.

According to the analysis of the proposal R2-111958 submitted by Huawei, for IM services, smart terminals in the RRC-CONNECTED state and in the DRX silent period do not need to send SRs or report periodic CQIs, and are semi-statically reserved for SRs. And the PUCCH resources reported by the CQI are wasted. Therefore, the PUCCH resource utilization rate of a large number of Smart Phone UEs in the RRC-CONNECTED state is very low, and there is a PUCCH resource bottleneck, which affects the IM service capacity.

The uplink SRS resources also overlap with the DRX silent period, resulting in waste of resources. The UE in the DRX silent period does not need to perform SRS, so the actual utilization rate of statically reserved SRS resources is very low, see Table 1 for details.

Table 1:

In addition, according to the control plane capacity defined in TR 25.913, in the case of 5M system bandwidth, the system supports 200 UEs in the RRC CONNECTED state at the same time, and in the case of greater than 5M system bandwidth, the system supports 400 UEs in the RRC CONNECTED state at the same time UE. Therefore, a maximum of 500 UEs in the RRC CONNECTED state are supported in the existing system design. When there are a large number (2000-5000) of connected Smart Phone UEs in the LTE system, there is a bottleneck in the uplink SRS resource. The specific analysis is as follows:

Assumption 1: For the convenience of estimation, it is assumed that the SRS periods of all UEs are the same, and under each comparison condition, the SRS bandwidths of all UEs are also the same.

Assumption 2: The system bandwidth is 10M, the SRS bandwidth is set according to TS 36.211, each cell has only 4 SRS bandwidth configurations, and the SRS period is estimated according to TS 36.213, including only 2/5/10/20/40/80/160 /320, the unit is ms. As shown in Figure 2, in each subframe, SRS can only be sent on the last OFDM symbol of a specific subframe, and the frequency domain interval of 2 subcarriers is used to form a "comb" frequency domain structure. Different, two "combs" can be frequency-division multiplexed. In the same "comb", more multiplexing can be performed by means of code division through different cyclic shifts (8 types in total) of the base sequence.

It can be seen from Table 2 that under the existing system configuration, if the IM service is fully supported, that is, 5,000 simultaneous online Smart Phone UEs are supported at the same time, the SRS period must be set to 160ms, and the SRS bandwidth can only be set to 4RB. It can be seen that there is also a bottleneck in the SRS resource.

Table 2:

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is to provide a method for sending multi-user uplink control signals in discontinuous reception mode, so as to reduce the waste of uplink control resources.

(2) Technical solution

In order to solve the above problems, the present invention provides a method for transmitting a multi-user uplink control signal in a discontinuous reception mode, comprising the following steps:

S1: Divide all intelligent terminal user equipment in the cell into several intelligent terminal groups;

S2: Allocate group public resources used only during the discontinuous reception activation period of each intelligent terminal user equipment for each intelligent terminal user equipment belonging to the same intelligent terminal user equipment in units of intelligent terminal groups;

S3: Each smart terminal user equipment sequentially occupies the group common resource of the smart terminal group to which it belongs during the discontinuous reception activation period, and sends an uplink control signal.

Preferably, the step S1 specifically includes: dividing the smart terminal user equipment in the RRC connection state into several smart terminal groups according to the same DRX cycle and DRX activation period.

Preferably, the number of intelligent terminal user equipment contained in each intelligent terminal group does not exceed the ratio of the discontinuous reception period of the intelligent terminal user equipment in the group to the discontinuous reception activation period.

Preferably, the sending method further includes configuring different discontinuous reception starting offsets for all intelligent terminal user equipment belonging to the same intelligent terminal group through a radio resource control message, so that different intelligent terminal user equipment in the same group The DRX active periods are orthogonal steps in the time domain.

Preferably, before configuring different discontinuous reception start offsets for the smart terminal user equipment, it also includes the step of sequentially numbering all the smart terminal user equipment belonging to the same smart terminal group, and then according to The serial numbers are sequentially configured with discontinuous reception start offsets for each intelligent terminal user equipment.

Preferably, the group common resources in step S2 are uplink group common sounding reference signal resources, which are used for sending sounding reference signals.

Preferably, the group common resource in step S2 is an uplink group common scheduling request resource for sending a scheduling request signal.

Preferably, the group of common resources in step S2 is an uplink group of common channel quality indication resources for sending channel quality indication signals.

(3) Beneficial effects

The present invention divides the intelligent terminal user equipment with the same DRX cycle and DRX activation period into the same intelligent terminal group, and the DRX activation periods of the members in the intelligent terminal group are orthogonal in the time domain, so that the eNodeB can group the same intelligent terminal The intelligent terminal user equipments in the group allocate common uplink group control resources, and the intelligent terminal user equipments in the group successively occupy the group uplink control resources during the DRX activation period, which reduces the waste of uplink control resources.

Description of drawings

FIG. 1 is a schematic diagram of the waste of uplink control resources semi-statically reserved by eNodeB because the intelligent terminal user equipment is in the DRX silent period in the prior art;

FIG. 2 is a schematic diagram of time-domain resource locations of SRS resources in the prior art;

FIG. 3 is a schematic diagram of frequency domain resource locations of SRS resources in the prior art;

4 is a schematic flowchart of a method for transmitting a multi-user uplink control signal in a discontinuous reception mode according to an embodiment of the present invention;

5 is a schematic diagram of a method for transmitting a multi-user uplink SRS signal in a discontinuous reception mode according to Embodiment 2 of the present invention;

FIG. 6 is a schematic diagram of time-frequency domain resource locations of CQI resources and SR resources in the prior art.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment one:

As shown in FIG. 4, this embodiment records a method for sending a multi-user uplink control signal in a discontinuous reception mode, including the following steps:

S1: Divide all intelligent terminal user equipment in the cell into several intelligent terminal groups;

In this embodiment, step S1 specifically includes:

According to the same discontinuous reception (DRX) cycle and discontinuous reception activation period, the intelligent terminal user equipment in the radio resource control connected (RRC CONNECTED) state is divided into several intelligent terminal groups; wherein, the intelligent terminal contained in each intelligent terminal group The number of user equipment does not exceed the ratio of the discontinuous reception period of the intelligent terminal user equipment in the group to the discontinuous reception activation period;

Perform sequential numbering within the group for all intelligent terminal user equipment belonging to the same intelligent terminal group, and use radio resource control messages for all intelligent terminal user equipment belonging to the same intelligent terminal group according to the serial numbers (i, i∈( 1, 2, . . . , n−1)) sequentially configure different discontinuous reception start offsets, so that the discontinuous reception activation periods of different intelligent terminal user equipments in the same group are orthogonal in the time domain. That is, when any intelligent terminal user equipment in the group is in the DRX activation period, other intelligent terminal user equipments are in the DRX silent period.

S2: Allocate group public resources used only during the discontinuous reception activation period of each intelligent terminal user equipment for each intelligent terminal user equipment belonging to the same intelligent terminal user equipment in units of intelligent terminal groups;

S3: Each smart terminal user equipment sequentially occupies the group common resource of the smart terminal group to which it belongs during the discontinuous reception activation period, and sends an uplink control signal.

The present invention is described below with more specific embodiment:

Embodiment two:

This embodiment records a method for sending a multi-user uplink sounding reference signal in a discontinuous reception mode, including the following steps:

S101: Divide all intelligent terminal user equipments in a cell into several intelligent terminal groups.

In this embodiment, step S101 specifically includes:

According to the same discontinuous reception (DRX) cycle and discontinuous reception activation period, the intelligent terminal user equipment in the radio resource control connected (RRC CONNECTED) state is divided into several intelligent terminal groups; wherein, the intelligent terminal contained in each intelligent terminal group The number of user equipment does not exceed the ratio of the discontinuous reception period of the intelligent terminal user equipment in the group to the discontinuous reception activation period;

Perform sequential numbering within the group for all intelligent terminal user equipment belonging to the same intelligent terminal group, and use radio resource control messages for all intelligent terminal user equipment belonging to the same intelligent terminal group according to the serial numbers (i, i∈( 1, 2, . . . , n−1)) sequentially configure different discontinuous reception start offsets, so that the discontinuous reception activation periods of different intelligent terminal user equipments in the same group are orthogonal in the time domain. That is, when any intelligent terminal user equipment in the group is in the DRX activation period, other intelligent terminal user equipments are in the DRX silent period.

S102: Allocate uplink common sounding reference signal (SRS) resources (period, bandwidth, frequency domain starting position and frequency hopping pattern) for each intelligent terminal user equipment belonging to the same intelligent terminal group in units of intelligent terminal groups; as shown in the figure As shown in 5, this embodiment uses a tree-like hierarchical structure to organize the initial positions of the SRS resources in the frequency domain of each intelligent terminal user equipment in the group.

S103: Each smart terminal user equipment successively occupies the common SRS resource of the uplink group of the smart terminal group to which it belongs, and sends an uplink SRS signal during its respective discontinuous reception activation period. As shown in FIG. 5 , each smart terminal user equipment uses the common SRS resource of the uplink group to send its own uplink SRS at different times.

The smart terminal user equipment can only send SRS signals during the DRX activation period, and one smart terminal user equipment can only send SRS signals n times within one DRX activation period, where n is the rounded value of the ratio of the DRX activation period to the SRS period.

The SRS signal is sent by frequency hopping in the frequency domain, and the offset function F _b of the frequency domain position of the SRS signal sent each time relative to the initial frequency domain position (as shown in Figure 3) is related to the number of transmissions (see TS36 for specific correspondence. .211), to detect a wider range of frequency domain channels through multiple transmissions. Therefore, the specific frequency domain position when the smart terminal user equipment sends the SRS signal during the DRX activation period is related to the cumulative number N of SRS signals sent by all the smart terminal user equipment in the group. N can be accumulated by each smart terminal user equipment. The number p of activation wake-ups, the number n of sending SRS signals during the DRX activation period, and the sequence number i in the smart terminal group are calculated.

Specifically, as shown in FIG. 5, each time the smart terminal user equipment sends an SRS signal, it needs to follow the initial position in the frequency domain as shown in FIG. The corresponding offset is calculated according to the corresponding relationship between the offset function F _b and the number of SRS transmissions, and then the frequency domain frequency hopping transmission is performed.

Embodiment three:

This embodiment records a method for sending a multi-user uplink scheduling request signal in a discontinuous reception mode, including the following steps:

S201: Divide all intelligent terminal user equipment in the cell into several intelligent terminal groups;

In this embodiment, step S201 specifically includes:

According to the same discontinuous reception (DRX) cycle and discontinuous reception activation period, the intelligent terminal user equipment in the radio resource control connected (RRC CONNECTED) state is divided into several intelligent terminal groups; wherein, the intelligent terminal contained in each intelligent terminal group The number of user equipment does not exceed the ratio of the discontinuous reception period of the intelligent terminal user equipment in the group to the discontinuous reception activation period;

Perform sequential numbering within the group for all intelligent terminal user equipment belonging to the same intelligent terminal group, and use radio resource control messages for all intelligent terminal user equipment belonging to the same intelligent terminal group according to the serial numbers (i, i∈( 1, 2, . . . , n−1)) sequentially configure different discontinuous reception start offsets, so that the discontinuous reception activation periods of different intelligent terminal user equipments in the same group are orthogonal in the time domain. That is, when any intelligent terminal user equipment in the group is in the DRX activation period, other intelligent terminal user equipments are in the DRX silent period.

S202: Allocate uplink group public scheduling request (SR) resources (period SR _PERIODICITY , subframe offset N _{OFFSET, SR} and PUCCH SR resource index) for each intelligent terminal user equipment belonging to the same intelligent terminal group in units of intelligent terminal groups ).

As shown in Figure 6, the PUCCH channel occupies a physical resource of one RB in the time-frequency domain. In the physical resource of one RB occupied, both PUCCH format 1/1a/1b and PUCCH format 2/2a/2b adopt code division Multiplex multiple PUCCH channels in a manner. Assume that the number of radio bearers (RB, Radio Bearer) allocated by the eNB to the PUCCH channel transmission is It broadcasts through broadcast messages, and the number of RBs allocated by eNB to PUCCH format 2/2a/2b (ie CQI) is It is also broadcast through broadcast messages. If PUCCH format 2/2a/2b and PUCCH format 1/1a/1b are not considered, then the system is reserved for PUCCH format 1/1a/1b (ie SR and ACK/NACK) The number of RBs is Since the transmission of PUCCH format 1/1a/1b undergoes two code spreading processes of "orthogonal spreading sequence" and "Zadoff-Chu sequence", the system uses PUCCH format 1 resource index Combinations of corresponding cyclic time shifts and orthogonal codewords are distinguished.

S203: Each smart terminal user equipment successively occupies the common SR resource of the uplink group of the smart terminal group to which it belongs, and sends an SR signal during their respective discontinuous reception activation periods. The location of the PUCCH resource where the smart terminal user equipment sends the SR satisfies slot fulfilled Among them, n _f is the subframe number, n _s is the time slot number, N _{OFFSET, SR} is the subframe offset, and SR _PERIODICITY is the SR period.

Embodiment four:

This embodiment records a method for sending a multi-user uplink channel quality indication signal in a discontinuous reception mode, including the following steps:

S301: Divide all intelligent terminal user equipment in the cell into several intelligent terminal groups;

In this embodiment, step S301 specifically includes:

According to the same discontinuous reception (DRX) cycle and discontinuous reception activation period, the intelligent terminal user equipment in the radio resource control connected (RRC CONNECTED) state is divided into several intelligent terminal groups; wherein, the intelligent terminal contained in each intelligent terminal group The number of user equipment does not exceed the ratio of the discontinuous reception period of the intelligent terminal user equipment in the group to the discontinuous reception activation period;

Perform sequential numbering within the group for all intelligent terminal user equipment belonging to the same intelligent terminal group, and use radio resource control messages for all intelligent terminal user equipment belonging to the same intelligent terminal group according to the serial numbers (i, i∈( 1, 2, . . . , n−1)) sequentially configure different discontinuous reception start offsets, so that the discontinuous reception activation periods of different intelligent terminal user equipments in the same group are orthogonal in the time domain. That is, when any intelligent terminal user equipment in the group is in the DRX activation period, other intelligent terminal user equipments are in the DRX silent period.

S302: Allocate uplink common channel quality indicator (CQI) resources for each intelligent terminal user equipment belonging to the same intelligent terminal group in units of intelligent terminal groups.

As shown in Figure 6, in this embodiment, the PUCCH channel occupies one RB physical resource in the time-frequency domain, and in the occupied one RB physical resource, the PUCCH format 1/1a/1b and the PUCCH format 2/2a/ 2b both use code division to multiplex multiple PUCCH channels. Without considering PUCCH format 2/2a/2b and PUCCH format 1/1a/1b hybrid radio bearer (RB, Radio Bearer), it is assumed that the initial eNB allocates resources for PUCCH format 2/2a/2a (ie CQI) transmission The number is PUCCH format 2/2a/2a implements multiplexing of different PUCCH channels in one RB through different cyclic shifts of Zadoff-Chu sequences with a length of 12. The system uses PUCCH format 1 resource index Differentiate the corresponding cyclic shift.

S303: Each smart terminal user equipment sequentially occupies the common CQI resource of the uplink group of the smart terminal group to which it belongs, and sends an uplink CQI signal during its respective discontinuous reception activation period.

Since the smart terminal user equipment can only send the CQI signal during the DRX activation period, an intelligent terminal user equipment can only send the CQI signal m times in a DRX activation period, where m is the rounded value of the ratio of the DRX activation period to the CQI period.

The present invention divides the intelligent terminal user equipment with the same DRX cycle and DRX activation period into the same intelligent terminal group, and the DRX activation periods of the members in the intelligent terminal group are orthogonal in the time domain, so that the eNodeB can group the same intelligent terminal The intelligent terminal user equipments in the group allocate common uplink group control resources, and the intelligent terminal user equipments in the group successively occupy the group uplink control resources during the DRX activation period, which reduces the waste of uplink control resources.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (2)

1. the sending method of multi-user's uplink control signal under discontinuous reception modes, is characterized in that, comprise the following steps:

S1: be the grouping of some intelligent terminals by intelligent terminal user classification of equipments all in community;

S2: being grouped into unit with intelligent terminal is that each intelligent terminal user equipment being under the jurisdiction of the grouping of same intelligent terminal distributes the group public resource only used in the discontinuous reception active period of each intelligent terminal user equipment;

S3: each intelligent terminal user equipment takies the group public resource of affiliated intelligent terminal grouping successively in respective discontinuous reception active period, sends uplink control signal;

Wherein, described step S1 specifically comprises: will be in the intelligent terminal user classification of equipment of wireless heterogeneous networks connection status to some intelligent terminal groupings according to identical discontinuous receiving cycle and discontinuous reception active period;

Wherein, also comprise: be the different discontinuous reception start offset amount of all intelligent terminal user Equipments Setting being under the jurisdiction of the grouping of same intelligent terminal by radio resource control information, make the step that the discontinuous reception active period of intelligent terminal user equipment different in same group is orthogonal in time domain;

Wherein, for before the discontinuous reception start offset amount that intelligent terminal user Equipments Setting is different, the all intelligent terminal user equipment also comprised for being under the jurisdiction of the grouping of same intelligent terminal carry out the step of the number consecutively in group, then are followed successively by each intelligent terminal user Equipments Setting discontinuous reception start offset amount according to institute's serialization number;

Organizing public resource described in step S2 is up group of public sounding reference signal resource;

Organizing public resource described in step S2 is up group of public scheduling request resources, for sending scheduling request signal;

Organizing public resource described in step S2 is up group of common signal channel quality indexed resource, for transmitting channel qualityindication signal.

2. the sending method of uplink control signal as claimed in claim 1, it is characterized in that, the intelligent terminal user number of devices comprised in each intelligent terminal grouping is no more than the discontinuous receiving cycle of intelligent terminal user equipment in this grouping and the ratio of discontinuous reception active period.