CN103517344B - The transmission method of uplink sounding reference signal - Google Patents

Abstract

This application discloses the transmission method of a kind of uplink sounding reference signal, including: when base station needs for user equipment (UE) collocating uplink interception reference signal SRS resource, it is SRS full bandwidth by the SRS frequency hopping band width configuration of described UE, make described UE SRS period L SRS and described UE ascending control channel on CQI period L CQI meet: LCQI=n*LSRS, and described SRS cycle is identical with the sub-frame offset in described CQI cycle, wherein said n is the default positive integer more than 1；When described base station needs to dispatch described UE, the reverse link traffic channel of described UE is arranged in the subframe different from described ascending control channel；Described UE is according to described configuration, according to the described SRS cycle, sends SRS signal to described base station；When according to described CQI cycle and SRS cycle, it is necessary to when same subframe carries out the transmission of the CQI information on described ascending control channel and described SRS signal, only send the CQI information on described ascending control channel.Adopt the present invention to have access to relatively multi-user, and be easily achieved.

Description

Transmission method of uplink listening reference signal

technical field

The invention relates to mobile communication technology, in particular to a method for transmitting an uplink listening reference signal (SRS).

Background technique

In order to improve uplink Frequency Selective Scheduling (FSS) performance, the LTE system sets an uplink Sensing Reference Signal (SRS) to measure the channel quality of a Physical Uplink Shared Channel (PUSCH) of a User Equipment (UE). SRS resources are distributed in a tree structure, each UE occupies a subband to send SRS signals, and the subband width is allocated by the eNB. Considering the number of users carried by SRS resources, eNB can allocate SRS sub-bands with smaller bandwidth occupied by each UE to ensure that more users are allowed to transmit SRS on the same frequency resources. However, if the UE's SRS transmission subband bandwidth is small, the obtained channel state information is limited, which will inevitably affect the FSS performance. For this reason, SRS transmission can be set to frequency hopping, even if a small sub-band is occupied in one transmission, but the SRS transmission bandwidth is increased by occupying different sub-bands in subsequent transmissions to ensure FSS performance.

The important factor in the _SRS frequency hopping mechanism is the frequency hopping bandwidth (the frequency hopping bandwidth index is expressed as b _hop ). On the one hand, it is the frequency hopping switch _of the user. It can be frequency hopping; on the other hand, it determines that the maximum bandwidth that the frequency hopping UE can transmit SRS is the bandwidth corresponding to b _hop . Assuming that the system parameter configuration of SRS is shown in Table 2, Table 1 shows the corresponding bandwidths when b _hop is 0, 1 and 2 respectively under the system parameter configuration. For example, when b _hop = 0, the corresponding bandwidth is the full bandwidth of SRS 96RB, when b _hop =1, the corresponding bandwidth is 32RB. When the SRS subband B _SRS =2 allocated by the network side to the Ue, its initial position is the first subband. If b _hop =1, then the UE meets the condition (B _SRS >b _hop ) and can frequency hop, its frequency hopping pattern is shown in Figure 1(a), the bandwidth of SRS transmission is limited to 2 subbands (32 RBs), and when When b _hop =0, the frequency hopping pattern of the UE is shown in Figure 1(b), and the bandwidth of the SRS transmission is increased to the full bandwidth of the SRS (96 RBs). Wherein, in Table 2, m _SRS,i is the RB data included in the subband when B _SRS =i, and N _i is the number of subbands included when B _SRS =i.

Table 1

Table 2

It can be seen from the above that the performance of SRS measurement in the existing SRS frequency hopping mechanism is affected by system parameters. For example, in order to access more users, it is necessary to set the SRS subband B _SRS = 2, and the frequency hopping bandwidth b _hop = 0. At this time, since the frequency hopping bandwidth b _hop = 0, the SRS needs to traverse all bandwidths, and in practical applications , in a channel with less serious frequency selection, traversing all bandwidths cannot effectively increase the gain, which will increase the complexity of the system; if in order to avoid traversing the full bandwidth of the SRS, the frequency hopping bandwidth b _hop = 1, then the measured The bandwidth is limited to 1/3 of the full bandwidth of the SRS, and the bandwidth is very limited. At this time, the ability to resist frequency selection will appear insufficient. It can be seen that the SRS configuration specified in the existing LTE system cannot avoid many problems caused by traversing the full bandwidth while ensuring the frequency selection performance.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for transmitting an uplink sounding reference signal, which can access more users and is easy to implement.

In order to achieve the above object, the technical scheme proposed by the present invention is:

A method for transmitting an uplink listening reference signal, comprising:

When the base station needs to configure uplink sensing reference signal SRS resources for the user equipment UE, the SRS frequency hopping bandwidth of the UE is configured as the full bandwidth of the SRS, so that the SRS period LSRS of the UE and the uplink control channel of the UE The CQI period LCQI satisfies: LCQI=n*LSRS, and the subframe offset of the SRS period and the CQI period are the same, wherein the n is a preset positive integer greater than 1; when the base station needs to schedule the For the UE, configuring the uplink traffic channel of the UE on a subframe different from that of the uplink control channel;

According to the configuration, the UE sends an SRS signal to the base station according to the SRS period; when according to the CQI period and the SRS period, it is necessary to perform the CQI information on the uplink control channel and the When sending the SRS signal, only the CQI information on the uplink control channel is sent.

In summary, the present invention proposes a method for transmitting an uplink listening reference signal, which configures the frequency hopping bandwidth as the full bandwidth of the SRS, and configures the CQI cycle as an integer multiple of the SRS cycle, so that the occurrence of a signal that needs to be in the same subframe In the case of sending the CQI information on the uplink control channel and the SRS signal, in this case, by giving up the sending of the SRS signal, the SRS signal transmission bandwidth configuration is not limited to the full bandwidth, thereby realizing the SRS signal transmission bandwidth Flexible configuration, easy to implement, and because the deleted time-frequency resources can be allocated to other UEs, it is beneficial to increase the number of user access.

Description of drawings

FIG. 1 is a schematic diagram of an SRS frequency hopping pattern;

Fig. 2 is a schematic flow chart of the method in Embodiment 1 of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

According to the existing LTE protocol, the transmission of SRS and uplink control channel (PUCCH format2/2a/2b) in the same subframe is not supported. If both SRS and uplink control channel need to be transmitted in one subframe, then the SRS signal will be dropped. , so this feature can be used to adjust the SRS transmission bandwidth by canceling the SRS through the uplink control channel.

Based on this, the core idea of the present invention is that when configuring SRS resources for the UE, the CQI period on the uplink control channel of the UE can be configured as an integer multiple of the SRS period, and the subframes corresponding to the CQI period and the SRS period are offset from each other. If the shift is the same, the SRS signal will be deleted periodically, so that the configuration of the transmission bandwidth of the SRS signal is not limited to the agreement, and the bandwidth allocation is more flexible. It is beneficial to increase the number of user access.

Fig. 2 is a schematic flow chart of the method of Embodiment 1 of the present invention, as shown in Fig. 2, the method includes:

Step 201. When the base station needs to configure uplink listening reference signal SRS resources for the user equipment UE, configure the SRS frequency hopping bandwidth of the UE as the full SRS bandwidth, so that the SRS cycle LSRS of the UE is compatible with the uplink control signal of the UE. The CQI period LCQI on the channel satisfies: LCQI=n*LSRS, and the subframe offset of the SRS period and the CQI period is the same, where the n is a preset positive integer greater than 1; when the base station When the UE needs to be scheduled, the uplink traffic channel of the UE is configured on a subframe different from that of the uplink control channel.

In this step, by making the CQI period on the uplink control channel configured for the UE an integer multiple of the SRS period, and the subframe offset of the SRS period and the CQI period are the same, it is ensured that SRS and uplink control occur. In the case that all channels need to be transmitted in one subframe, in this way, the transmission of part of the SRS can be given up according to the existing system protocol.

It should be noted here that in this step, in order to ensure that the CQI is transmitted on the uplink control channel, it is necessary to prevent the base station from scheduling the UE to transmit on the uplink traffic channel in the subframe of the periodic CQI, that is, when the base station needs to schedule the UE When , configure the uplink traffic channel of the UE on a subframe different from that of the uplink control channel.

Specifically, according to the existing system, when the base station needs to configure uplink sensing reference signal SRS resources for the user equipment UE, that is, when a radio resource control (RRC) connection or RRC reconfiguration or RRC re-establishment is established for the UE.

Specifically, in an LTE system, the uplink control channel may be a physical uplink control channel (PUCCH), and the uplink traffic channel may be a physical uplink shared channel (PUSCH).

Preferably, according to the existing system protocol, configuring the SRS frequency hopping bandwidth of the UE as the full SRS bandwidth can be achieved by the following specific methods:

The frequency hopping bandwidth index b _hop of the UE is configured as 0, and at the same time, in order to meet the frequency hopping condition: the SRS subband number (B _SRS ) is greater than b _hop , the SRS subband number B _SRS of the UE needs to be configured as 1 , 2 or 3.

In practical applications, the n only needs to be an integer greater than 1. Preferably, in order to further facilitate the division of channels and reduce the complexity of the system, the value of n can be made less than or equal to M, and the M is when the subband width is the SRS subband number B _SRS corresponding to the UE The bandwidth is the total number of subbands divided by the full bandwidth of the SRS. Based on this, according to the existing system protocol, preferably, the value range of n may be: 2≤n≤6. In practical applications, those skilled in the art can adjust the bandwidth occupied by the SRS by adjusting the size of n, that is, when n is larger, the situation that both the SRS and the uplink control channel need to be transmitted in one subframe is smaller, and the SRS is blocked. The fewer SRSs dropped, the larger the SRS transmission bandwidth. When n is smaller, the more SRSs and uplink control channels need to be transmitted in one subframe, the more SRSs are dropped, and the smaller the SRS transmission bandwidth. Those skilled in the art can make use of this law to set and adjust n reasonably according to actual needs.

Step 202, the UE sends an SRS signal to the base station according to the SRS period according to the configuration; when according to the CQI period and the SRS period, it is necessary to perform CQI information on the uplink control channel in the same subframe When sending the SRS signal, only the CQI information on the uplink control channel is sent.

This step is used to implement the function that when both the SRS and the uplink control channel need to be transmitted in one subframe, the SRS signal will be canceled, that is, only the CQI information is sent here. In this way, the user's SRS transmission bandwidth is not limited to the configured full SRS bandwidth. Correspondingly, based on this effect, the system can arrange new user transmission at the position where the SRS is destroyed. For example, based on the above scheme, it can be realized that the frequency band of the interference source occupies 1/3 of the frequency band in the interference coordination algorithm. If considering Resource reservation, the central user occupies the non-interference frequency band (2/3 frequency band). In this way, uplink scheduling requirements are met and the number of access users can be increased.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. the transmission method of a uplink sounding reference signal, it is characterised in that including:

When base station needs for user equipment (UE) collocating uplink interception reference signal SRS resource, it is SRS full bandwidth by the SRS frequency hopping band width configuration of described UE, make described UE SRS period L SRS and described UE ascending control channel on CQI period L CQI meet: LCQI=n*LSRS, and described SRS cycle is identical with the sub-frame offset in described CQI cycle, wherein said n is the default positive integer more than 1；When described base station needs to dispatch described UE, the reverse link traffic channel of described UE is arranged in the subframe different from described ascending control channel；

Described UE is according to described configuration, according to the described SRS cycle, sends SRS signal to described base station；When according to described CQI cycle and SRS cycle, it is necessary to when same subframe carries out the transmission of the CQI information on described ascending control channel and described SRS signal, only send the CQI information on described ascending control channel.

2. method according to claim 1, it is characterised in that described ascending control channel is Physical Uplink Control Channel PUCCH.

3. method according to claim 1, it is characterised in that described reverse link traffic channel is Physical Uplink Shared Channel PUSCH.

4. method according to claim 1, it is characterised in that described to be SRS full bandwidth by the SRS frequency hopping band width configuration of described UE be:

The frequency hopping bandwidth of described UE is indexed b_hopIt is configured to 0, by the SRS subband B of described UE_SRSIt is configured to 1,2 or 3.

5. method according to claim 1, it is characterised in that described n is as the SRS subband B that subband width is described UE less than or equal to M, described M_SRSThe sub-band sum that during corresponding bandwidth, SRS full bandwidth marks off.

6. method according to claim 5, it is characterised in that described n meets: 2≤n≤6.