CN111918400A

CN111918400A - SRS resource allocation method and device

Info

Publication number: CN111918400A
Application number: CN201910376846.8A
Authority: CN
Inventors: 蒋一鸣
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-05-07
Filing date: 2019-05-07
Publication date: 2020-11-10
Anticipated expiration: 2039-05-07
Also published as: CN111918400B

Abstract

The embodiment of the invention provides an SRS resource allocation method and an SRS resource allocation device, wherein the method comprises the following steps: determining a pre-estimated SRS resource of a cell; determining a target service delay requirement of the user terminal in the cell; determining SRS resources of the user by adopting the target service delay requirement of the user terminal; adopting the cell to predict SRS resources to adjust the user SRS resources; and allocating the adjusted SRS resource of the user to the user terminal. The embodiment of the invention can effectively ensure that the time delay requirements in the service initial stage and the service continuous stage process of the user terminal with the high time delay requirement in the 5G NR communication system can be met, thereby ensuring the user perception.

Description

SRS resource allocation method and device

Technical Field

The present invention relates to the field of mobile communications, and in particular, to an SRS resource allocation method and an SRS resource allocation apparatus.

Background

The SRS (Sounding Reference Signal) is mainly used for uplink Channel Sounding so that a network side can obtain uplink CQI (Channel Quality Indicator) information and downlink forming information of a UE (User Equipment).

When configuring SRS time-frequency domain resources for a UE, the existing LTE (Long Term Evolution) network architecture generally considers the capacity of a cell user terminal, the moving speed of the user terminal, and the measurement signal-to-noise ratio requirements of SRS signals. When the number of the user terminals is less, allocating larger frequency domain resources and smaller periods to the user terminals; when the number of the user terminals is more, allocating smaller frequency domain resources and larger periods to the user terminals; when the moving speed of the user terminal is slow, a larger SRS period can be allocated to the user terminal, but once the moving speed of the user terminal is fast, the SRS period is shortened, so that the channel estimation result can be updated in time, and the channel estimation can track the change condition of an upper channel; when the channel state of the user terminal is good, a larger SRS frequency domain Resource (a longer SRS sequence) can be allocated to the user terminal, so as to obtain a better channel estimation performance, and when the channel state of the user terminal is poor, the number of Physical Resource Blocks (PRBs) allocated to the SRS needs to consider the transmission power of the user terminal, and if too many PRBs are allocated, the reception power on a single PRB is reduced, which is not favorable for channel estimation.

Modern mobile communication is increasingly tending to provide multimedia services for high-rate transmission, and 5G technology has become a major research field of modern mobile communication. When a base station in a 5G NR (New Radio, New air interface) system allocates SRS time-frequency domain resources to a UE, the allocation of frequency domain resources (including whether frequency domain hopping granularity is used) and time domain periods is generally determined in consideration of the capacity of a cell user terminal, the power limitation of the user terminal, and the channel variation condition. Different from the LTE system, for example, in services such as Virtual Reality (VR) service in 5G, real-time information transmission of car networking, remote control, etc., the end-to-end service delay requirement reaches 10ms or even 5ms, whereas in a commonly used eMBB (enhanced Mobile Broadband) frame structure, only 5ms or 2.5ms has 1 self-contained timeslot for transmitting an uplink SRS signal, if the entire bandwidth cannot be detected by transmitting a complete SRS signal within one period (5ms or 2.5ms), measurement of uplink channel quality and a transmission time point of downlink service may be affected, so that the high delay requirement of service cannot be met, and user perception cannot be guaranteed.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide an SRS resource allocation method to meet the requirement of high latency of service and ensure user perception.

Correspondingly, the embodiment of the invention also provides an SRS resource allocation device, which is used for ensuring the realization and the application of the method.

In order to solve the above problem, the present invention discloses an SRS resource allocation method, which specifically includes:

determining a pre-estimated SRS resource of a cell;

determining a target service delay requirement of the user terminal in the cell;

determining SRS resources of the user by adopting the target service delay requirement of the user terminal;

adopting the cell to predict SRS resources to adjust the user SRS resources;

and allocating the adjusted SRS resource of the user to the user terminal.

Preferably, the estimated SRS resource of the cell includes an estimated symbol number of the SRS of the cell and an estimated period of the SRS of the cell, and the step of determining the estimated SRS resource of the cell includes:

acquiring cell capacity, cell basic time delay requirements and cell channel quality requirements;

calculating the theoretical symbol number of the cell SRS and the theoretical period of the cell SRS by adopting the cell capacity, the cell basic time delay requirement and the cell channel quality requirement;

and determining the estimated symbol number of the cell SRS and the estimated period of the cell SRS by adopting the theoretical symbol number of the cell SRS, the theoretical period of the cell SRS and a preset margin factor.

Preferably, the SRS resource of the user includes a first SRS symbol number of the user, a first SRS period of the user, and a first SRS bandwidth of the user.

Preferably, the step of adjusting the SRS resource of the user by using the cell pre-estimated SRS resource includes:

acquiring the moving speed of the user terminal and the quality requirement of a service channel;

determining a second SRS bandwidth of the user by adopting the service channel quality requirement of the user terminal;

determining a bandwidth required by a user by adopting the first SRS bandwidth of the user and the second SRS bandwidth of the user;

acquiring a second SRS symbol number and a second SRS period of the user by adopting the moving speed of the user terminal;

determining the number of symbols required by the user by adopting the second SRS symbol number of the user;

and determining a user requirement period by adopting the second SRS period of the user.

Preferably, the step of determining a bandwidth required by the user by using the first SRS bandwidth of the user and the second SRS bandwidth of the user includes:

determining a bandwidth maximum value in the first SRS bandwidth and the second SRS bandwidth of the user;

and determining the maximum bandwidth as the bandwidth required by the user.

Preferably, after the step of determining a bandwidth required by a user by using the first SRS bandwidth of the user and the second SRS bandwidth of the user, the method further includes:

judging whether the bandwidth required by the user is smaller than a preset user BWP bandwidth or not;

and if so, starting a bandwidth frequency hopping mode.

Preferably, the step of determining the number of symbols required by the user by using the second SRS symbol number of the user terminal includes:

determining the maximum value of the first SRS symbol number of the user and the second SRS symbol number of the user as the number of the symbols to be determined by the user;

and determining the minimum value of the number of the symbols to be determined by the user and the number of the estimated symbols of the cell SRS as the number of the symbols required by the user.

Preferably, the step of determining a user requirement period by using the second SRS period of the user includes:

determining the minimum value of the period of the SRS predicted period of the cell, the first SRS period of the user and the second SRS period of the user;

and determining the minimum period value as a user demand period.

Preferably, the step of determining the target service delay requirement of the user terminal in the cell includes:

acquiring a service delay requirement of at least one user terminal in the cell;

and determining the service delay requirement with the lowest delay as the target service delay requirement.

Preferably, before the step of adjusting the SRS resource of the user by using the cell to predict the SRS resource, the method further includes:

setting a trigger condition;

and when the triggering condition is met, executing the step of adopting the cell to predict the SRS resource to adjust the user SRS resource.

The embodiment of the invention also provides an SRS resource allocation device, which specifically comprises:

the cell SRS resource pre-estimation module is used for determining pre-estimated SRS resources of a cell;

a service delay requirement determining module, configured to determine a target service delay requirement of the user equipment in the cell;

a user SRS resource initial determining module, which is used for determining the user SRS resource by adopting the target service delay requirement of the user terminal;

a user SRS resource adjusting module, which is used for adopting the cell to predict SRS resources to adjust the user SRS resources;

and the module is distributed to the user terminal and used for distributing the adjusted SRS resource of the user to the user terminal.

Preferably, the estimated SRS resource of the cell includes an estimated symbol number of the SRS of the cell and an estimated period of the SRS of the cell, and the module for estimating the SRS resource of the cell includes:

the cell information acquisition submodule is used for acquiring cell capacity, cell basic time delay requirements and cell channel quality requirements;

the cell theoretical SRS resource calculation submodule is used for calculating the cell SRS theoretical symbol number and the cell SRS theoretical period by adopting the cell capacity, the cell basic time delay requirement and the cell channel quality requirement;

and the cell SRS resource estimation sub-module is used for determining the number of the cell SRS estimation symbols and the cell SRS estimation period by adopting the cell SRS theoretical symbol number, the cell SRS theoretical period and a preset margin factor.

Preferably, the SRS resource adjusting module for the user includes:

the user terminal information acquisition submodule is used for acquiring the moving speed of the user terminal and the quality requirement of a service channel;

a service channel quality requirement processing submodule, configured to determine a second SRS bandwidth of the user by using the service channel quality requirement of the user terminal;

a user required bandwidth determining submodule, configured to determine a user required bandwidth by using the first SRS bandwidth of the user and the second SRS bandwidth of the user;

a moving speed processing submodule, configured to obtain a second SRS symbol number of the user and a second SRS period of the user by using the moving speed of the user terminal;

the user demand symbol number determining submodule is used for determining the user demand symbol number by adopting the user second SRS symbol number;

and the user requirement period determining submodule is used for determining the user requirement period by adopting the second SRS period of the user.

Preferably, the user required bandwidth determining submodule includes:

a user bandwidth maximum value determining unit, configured to determine a bandwidth maximum value in the user first SRS bandwidth and the user second SRS bandwidth;

and the user required bandwidth determining unit is used for determining the maximum bandwidth as the user required bandwidth.

Preferably, the SRS resource adjusting module for the user further includes:

the frequency hopping judging submodule is used for judging whether the bandwidth required by the user is smaller than the preset BWP bandwidth of the user;

and the frequency hopping execution submodule is used for starting a bandwidth frequency hopping mode when the bandwidth required by the user is smaller than the preset bandwidth of the user BWP.

Preferably, the user requirement symbol number determining submodule includes:

the user undetermined symbol number determining unit is used for determining the maximum value of the first SRS symbol number of the user and the second SRS symbol number of the user as the user undetermined symbol number;

and the user demand symbol number determining unit is used for determining the minimum value of the number of the symbols to be determined by the user and the number of the estimated symbols of the cell SRS as the number of the symbols required by the user.

Preferably, the user requirement cycle determining submodule includes:

a user minimum period determining unit, configured to determine a minimum period value in the cell SRS prediction period, the user first SRS period, and the user second SRS period;

and the user demand period determining unit is used for determining the minimum period value as a user demand period.

Preferably, the service delay requirement determining module includes:

a service delay obtaining submodule, configured to obtain at least one service delay requirement of the user terminal in the cell;

and the target service delay determining submodule is used for determining the service delay requirement with the lowest delay as the target service delay requirement.

Preferably, the apparatus further comprises:

the trigger setting module is used for setting trigger conditions;

and the triggering execution module is used for calling the user SRS resource adjustment module when the triggering condition is met.

Compared with the background art, the embodiment of the invention has the following advantages:

in the embodiment of the invention, the SRS resources of the users are determined by determining the pre-estimated SRS resources at the cell level and the target service delay requirement of the user terminal in the cell and adopting the target service delay requirement of the user terminal; regulating the SRS resources of the users by combining the pre-estimated SRS resources of the cell; the adjusted SRS resource of the user is distributed to the user terminal, so that the time delay requirement of the user terminal with high time delay requirement service in the 5G NR system in the service initial stage and the service continuous stage process can be effectively met, and the user perception is ensured.

Drawings

FIG. 1 is a schematic diagram of possible transmission positions of SRS in a slot;

FIG. 2 is a diagram of an exemplary NR frame structure;

fig. 3 is a schematic diagram of another NR typical frame structure;

FIG. 4 is a flowchart illustrating steps of an embodiment of a method for allocating SRS resources according to the present invention;

FIG. 5 is a flowchart illustrating steps of another embodiment of a SRS resource allocation method according to the present invention;

FIG. 6 is a flowchart illustrating steps of a specific example of a method for SRS resource allocation according to the present invention;

fig. 7 is a block diagram of an SRS resource allocation apparatus according to an embodiment of the present invention;

fig. 8 is a block diagram of another SRS resource allocation apparatus according to another embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

For convenience of description of the following embodiments, SRS resource allocation in the 5G NR system is described: in the NR system, the uplink SRS signal may be a {1, 2, 4} port, and the starting symbol position of the SRS may be at a certain uplink timeslot or at the position of the last 6 uplink OFDM (Orthogonal Frequency Division Multiplexing) symbols of the self-contained timeslot, that is, the SRS resource may be configured as Ns ═ 1, 2, 4} consecutive OFDM symbols, and the time domain position of the SRS resource is at the last 6 symbols of a timeslot, where each symbol on the SRS resource is mapped to all antenna ports. For a given SRS Resource, a repetition factor R is configured to be {1, 2, 4} by a high-level parameter SRS-Resource Mapping, and R is less than or equal to Ns. When the SRS resource in each timeslot is not configured with frequency hopping (R ═ Ns), all antenna ports are mapped to the same subcarrier set occupying the same PRB on each OFDM symbol; when frequency hopping is configured and not repeated (R is 1), according to SRS frequency hopping parameter C_SRSB_SRSb_hop(see section 6.4.1.4.3 of protocol 38.211) within each OFDM symbol, all antenna ports are mapped to a different set of subcarriers, which isWherein the different sub-carriers use the same comb value; when both hopping and repetition factors are configured, e.g., Ns 4 and R2, then within each pair of R consecutive OFDM symbols, all antenna ports are mapped onto the same set of subcarriers, and hopping is performed between each pair of symbols according to SRS hopping parameters.

The SRS can carry out intra-slot frequency hopping and inter-slot frequency hopping in a BWP (Band Width Part).

The aperiodic SRS resource may be configured with Ns 2or4 consecutive symbols, frequency hopping is performed in an intra-slot within one BWP, when frequency hopping is configured and R is 1, during Ns symbols, the entire frequency hopping bandwidth within the BWP is detected, and the size of the detected sub-band is the same each time. The UE may configure Ns-4 aperiodic SRS resources for hopping within an intra-slot in one BWP, and when R is configured to be 2, detect the entire hopping bandwidth in the BWP between two pairs of R consecutive symbols. All antenna ports within each pair of R consecutive symbols are mapped on the same set of subcarriers.

On a periodic or semi-static SRS resource, Ns ═ 1 symbol may be configured, and inter-slot frequency hopping is performed in one BWP, where the symbol positions occupied by the SRS resource in each slot are the same. Possible transmission positions of the SRS within the slot are shown with reference to fig. 1.

On the periodic or semi-static SRS resource, Ns 2or4 continuous symbols may also be configured, and intra-slot and inter-slot frequency hopping is performed within one BWP, where Ns symbols occupied by the SRS resource in each slot have the same position. For example, when frequency hopping is configured and R is 2, intra-slot and inter-slot frequency hopping is supported, and in each slot, between two pairs of R consecutive symbols, all antenna ports are mapped on different subcarrier sets, and in each pair of R consecutive symbols, all antenna ports are mapped on the same subcarrier set. For Ns ═ R, inter-slot hopping is supported when hopping is configured, and all antenna ports are mapped on the same set of subcarriers within R consecutive symbols.

NR system bandwidth 100M, 273 PRBs, NR typical frame structure includes, 5G frame structure 1: 2.5ms double period structure (DDDSUDDSUU), and 5G frame structure 2: 5ms frame structure (DDDDDDDSUU). The 5G frame structure 1 is shown in fig. 2, and the 5G frame structure 2 is shown in fig. 3.

Referring to fig. 4, a flowchart illustrating a first step of an SRS resource allocation method according to an embodiment of the present invention is shown, where the method may include the following steps:

step 101, determining an estimated SRS resource of a cell.

In this step, the system side determines the pre-estimated SRS resource of the cell, mainly determines the requirement of the cell-level SRS resource, and makes preparation for the subsequent adjustment and allocation of the SRS resource of each user.

Step 102, determining the target service delay requirement of the user terminal in the cell.

In this step, the service delay requirements of each user terminal may be different, the SRS resource allocation is performed according to the target service delay requirements of different user terminals, a single user terminal is used as a target for research, and the SRS resource allocation scheme of each user terminal performs the method of the embodiment of the present invention, specifically, the SRS resource allocation scheme is allocated simultaneously or sequentially according to priorities, which is not limited in the present invention.

And 103, determining the SRS resource of the user by adopting the target service delay requirement of the user terminal.

In this step, SRS resources of a user are calculated according to a target service delay requirement of a user terminal, in a 5G NR system, each user may establish a plurality of DRBs (user Data Radio Bearer (user level) each carrying different 5QI (5th Qos flow Index) attributes, and the SRS resources of the user are determined according to the target service delay requirement of the user terminal.

And 104, adopting the cell estimated SRS resource to adjust the SRS resource of the user.

In this step, the SRS resource of the user includes a period, a frequency hopping bandwidth, and a symbol number, and in the process of processing and allocating the SRS resource of the user, the processing method, the processing sequence, the processing parameters, the boundary conditions, or the constraint conditions can be automatically adjusted according to the features of the SRS resource, so that the SRS resource is adapted to the statistical distribution features and the structural features of the processed resource data, thereby obtaining the process of the optimal processing effect, and making the SRS resource allocation of the user more reasonable.

And 105, allocating the adjusted user SRS resource to the user terminal.

In this step, the user terminal is a terminal device capable of connecting to a communication network, and can transmit and send data signals, such as a mobile phone, a computer, an iPad, and the like. Generally, after the SRS resource of the user is adjusted, the embodiment of the present invention allocates the adjusted SRS resource of the user to the user terminal through the 5G network.

In the embodiment of the invention, the SRS resources of the users are determined by determining the pre-estimated SRS resources at the cell level and the target service delay requirement of the user terminal in the cell and adopting the target service delay requirement of the user terminal; regulating the SRS resources of the users by combining the pre-estimated SRS resources of the cell; the adjusted SRS resource of the user is distributed to the user terminal, so that the time delay requirements of the user terminal with high time delay service in the 5G NR system in the service initial stage and the service continuous stage process can be effectively met, and the user perception is ensured.

Referring to fig. 5, a flowchart illustrating steps of a second embodiment of an SRS resource allocation method according to the present invention is shown, where the method may include the following steps:

step 201, determining the estimated SRS resource of the cell.

In general, the predicted SRS resource at the cell level may include the number of predicted symbols for the cell SRS and the period of the predicted symbol for the cell SRS.

In a preferred embodiment of the present invention, the step of determining the predicted SRS resource of the cell may include the following sub-steps:

and a substep 2011 of acquiring the cell capacity, the cell basic delay requirement and the cell channel quality requirement.

And a substep 2012, calculating the theoretical symbol number of the cell SRS and the theoretical period of the cell SRS by using the cell capacity, the cell basic delay requirement and the cell channel quality requirement.

And a substep 2013 of determining the estimated symbol number of the cell SRS and the estimated period of the cell SRS by adopting the theoretical symbol number of the cell SRS, the theoretical period of the cell SRS and a preset margin factor.

The method comprises the steps that a system side firstly calculates a basic theoretical SRS requirement on the basis of cell capacity requirements, basic service delay requirements and basic channel measurement effectiveness requirements, the basic theoretical SRS requirement can be a statistical average value or a statistical minimum value, and then a certain margin factor is considered on the basis of the basic theoretical SRS requirement to determine the estimated requirement of cell-level SRS resources. Taking a specific example below, for example, according to the basic average moving speed of a cell user terminal of 30km/h and the service delay requirement of 100ms, each user terminal configures 2 theoretical OFDM symbols, the basic user terminal requirement of the cell (for example, 400 or 1200 connected user terminals) is calculated, M SRS theoretical OFDM symbol numbers need to be configured within 1s, and actually configured SRS resources are SRS theoretical OFDM symbol numbers multiplied by a certain estimated margin factor α, and the calculation method of the cell SRS estimated period is similar, where α may be configured to be 1.3 to 1.5.

Step 202, determining the target service delay requirement of the user terminal in the cell.

In step 202, each ue usually has multiple services, and the delay requirement of each service may be different, so as to meet the delay requirement of the ue as much as possible.

Therefore, most preferably, the step 202 may include the following sub-steps:

substep 2021, obtaining at least one service time delay requirement of user terminal in the cell;

substep 2022, determining the service delay requirement with the lowest delay as the target service delay requirement.

Step 203, determining the user SRS resource by using the target service delay requirement of the user terminal.

In step 203, the SRS resource of the user may include a first SRS symbol number of the user, a first SRS period of the user, and a first SRS bandwidth of the user.

Step 204, setting a trigger condition.

In the embodiment of the present invention, the trigger condition may be set as periodic trigger, and when a preset adjustment period is reached, the dynamic adjustment of the SRS resource of the user terminal is automatically triggered. Further, the trigger condition may be set from the perspective of the SRS frequency domain PRB (Physical Resource Block), the SRS period, the number of SRS OFDM symbols, and the like. For example, when the uplink measured UE channel quality meets a preset trigger condition or the UE moving speed reaches the preset trigger condition, a dynamic resource allocation procedure may be triggered.

Step 205, judging whether the current state meets the trigger condition, and executing step 206 when the trigger condition is met.

And step 206, adopting the cell estimated SRS resource to adjust the SRS resource of the user.

In the embodiment of the invention, the frequency hopping bandwidth of the SRS resource of the user needs to consider the initial or actual activation of the user, and the frequency hopping bandwidth is the allocated bandwidth resource according to the actual adjustment, which may not be the whole cell bandwidth.

In a preferred embodiment of the present invention, this step 206 may comprise the following sub-steps:

sub-step 2061, obtaining the moving speed of the user terminal and the quality requirement of the service channel.

Sub-step 2062, determining the second SRS bandwidth of the user by using the quality requirement of the traffic channel of the user terminal.

In this sub-step 2062, the second SRS bandwidth of the user is determined according to the channel quality of the user terminal, and the power level for the user terminal to transmit a single PRB (Physical Resource Block) is calculated according to the Signal to Interference plus Noise Ratio (SINR) and the path loss information. For users with limited power, the number of PRBs needs to be reduced, and the PSD (power spectral density) needs to be increased to ensure that the received SINR meets the requirement. For users with unlimited power, PRBs can be actually scheduled, and the PRBs can also be expanded, so that the measurement performance is improved by using longer SRS sequences.

And a substep 2063 of determining a bandwidth required by the user by using the first SRS bandwidth of the user and the second SRS bandwidth of the user.

In sub-step 2063, a maximum bandwidth value of the first SRS bandwidth of the user and the second SRS bandwidth of the user may be determined; and then determining the maximum bandwidth as the bandwidth required by the user.

After sub-step 2063, as another preferred embodiment, when the user demanded bandwidth is determined, it may be determined whether the calculated user demanded bandwidth is smaller than a preset user BWP bandwidth; and when the bandwidth required by the user is smaller than the preset BWP bandwidth of the user, starting a bandwidth frequency hopping mode.

Frequency hopping is a spread spectrum method commonly used in wireless communication, and the working principle of the frequency hopping is that the carrier frequency of signals transmitted by a transmitting party and a receiving party changes discretely according to a preset rule. That is, the carrier frequency used in communication is randomly hopped under the control of the pseudo-randomly varying code. In terms of implementation of communication technology, frequency hopping is a communication method that uses a code sequence to perform multi-frequency shift keying. From a signal spectrum perspective, the frequency hopping signal generally occupies a wide frequency band. In such a communication system, the radio frequency bandwidth used for signal transmission is several tens of times, several hundreds of times, or several thousands of times as large as the original signal bandwidth. But only for a certain moment it only operates at a certain frequency.

The frequency hopping is a program preset in the whole network, and all stations in the network are automatically controlled to synchronously change the frequency for a plurality of times in one second and stay on each frequency hopping channel for a short time. The periodic synchronous signaling is sent from the master station to instruct all the slave stations to change the working frequency in a jumping mode at the same time. The frequency hopping technique is employed to ensure secrecy and interference resistance of communication. Compared with fixed frequency communication, frequency hopping communication is more concealed and is difficult to intercept. As long as the opposite side does not know the carrier frequency hopping rule, the communication content of the opposite side is difficult to intercept. Meanwhile, frequency hopping communication also has good anti-interference capability, and normal communication can be carried out on other non-interfered frequency points even if some frequency points are interfered.

And a substep 2064 of obtaining a second SRS symbol number and a second SRS period of the user by using the moving speed of the user terminal.

Sub-step 2065, determining the number of the symbols required by the user by using the second SRS symbol number of the user terminal.

In the sub-step 2065, a maximum value of the first SRS symbol number of the user and the second SRS symbol number of the user may be determined as a number of symbols to be determined by the user; and then determining the minimum value of the number of the symbols to be determined by the user and the number of the estimated symbols of the cell SRS as the number of the symbols required by the user.

Sub-step 2066, determining the user demand period by using the second SRS period of the user terminal.

In sub-step 2066, the minimum value of the period of the SRS estimation period, the first SRS period, and the second SRS period of the user may be determined; and then determining the minimum value of the period as the period required by the user.

When a Channel is changed rapidly, and an SRS resource is used for downlink beam forming or uplink CQI (Channel Quality Indicator) measurement AMC (Adaptive Modulation and Coding), mode switching, beam management, or the like, validity of SRS measurement information needs to be ensured.

Step 207, allocating the adjusted SRS resource of the user to the user terminal.

In order to enable those skilled in the art to better understand the embodiments of the present invention, the following description is provided for a specific example, but it should be understood that the embodiments of the present invention are not limited thereto.

The embodiment of the invention comprehensively determines the SRS bandwidth, the SRS symbol number and the period of the user by combining the requirement of the user on 5QI delay, the requirement on channel quality SNR and the requirement on moving speed. For ease of description, referring to fig. 6, the steps in this particular example will not be fully categorized according to the steps of the embodiments described above.

301, the system side first calculates a basic SRS requirement on the basis of the cell capacity requirement, the basic service delay requirement, and the basic channel measurement validity requirement (the basic requirement may be an average value or a minimum value of statistics), and determines the SRS resource of the cell level by considering a certain margin factor on the basisRequirement N_symbol-cellAnd T_{srs_cell}. For example, according to the average moving speed of 30km/h and the service delay requirement of 100ms, each user configures 2 OFDM symbols, the actual cell user requirement (for example, the number of connected users is 400 or 1200) calculates the number of theoretical symbols of the SRS of the cell that needs to be configured in 1s, and the final actual estimated number of estimated symbols of the SRS of the cell configured is:

N_symbol-cell＝M*α

wherein, alpha is SRS resource estimated allowance factor, and can be configured to be 1.3-1.5.

302, each user terminal in 5G NR can establish multiple DRB bearers, each bears different 5QI attributes, and determines SRS time-frequency domain resources of the user according to the service type with the highest time delay requirement of multiple services of the user terminal, including a first SRS period T of the user_ue-5qi(millisecond), user first SRS Bandwidth M_prb-ue-5qiThe first SRS symbol number N of the user_{symbol-ue-5qi}。

The minimum time delay (second) of the service processing is as follows:

D＝min{D_ue-5qi,j}

wherein D is_ue-5qi,j5QI delay requirements for different services of the user terminal.

The preset BWP bandwidth of the UE is BWP_ueAnd the SRS repetition factor is R, the number of SRS symbols within 1s is:

floor(N_{symbol-ue-5qi}/T_ue-5qi)

the number of OFDM symbols required for UE to traverse BWP is:

ceiling(BWP_ue/M_prb-ue-5qi)*R

simultaneously, the requirements are satisfied:

D/floor(N_{symbol-ue-5qi}/T_ue-5qi)≥ceiling(BWP_ue/M_prb-ue-5qi)*R

the bandwidth at this time needs to take into account the user initial BWP or the actually activated BWP, which may not be the entire cell bandwidth.

303, the triggering condition is set as periodic triggering according to the moving speed of the UE and the change of the user channel quality, and further, the triggering condition can also be triggered when the UE channel quality measured by uplink or the calculated moving speed of the UE meets a certain preset condition, so as to implement the update process of dynamic resource allocation. For example, the calculated SRS user required bandwidth required to be sent to the user starts frequency hopping when the user required bandwidth is smaller than the BWP bandwidth preset by the user, otherwise, the SRS user required bandwidth is not frequency hopped.

304, determining a second SRS bandwidth M of the user according to the user channel quality_prb-ue-snrThe power level of the terminal single PRB (Physical Resource Block) transmission can be calculated according to the received target SINR (Signal to Interference plus Noise Ratio) and the path loss information, and for a poor user, when the power is limited, the number of PRBs needs to be reduced to M_prb-ue-snrIncreasing the PSD (power spectral density) ensures that the received SINR meets the requirements. Better users may use the actual scheduling PRB as M_prb-ue-snrPreferably, the user power is not limited, and prb can be extended to M_prb-ue-snrAnd the longer SRS sequence is used for improving the measurement performance.

305, determining the transmitted user required bandwidth M_ueComprises the following steps:

M_ue＝max{M_prb-ue-snr，M_prb-ue-5qi}

when M is_ueAnd when the bandwidth is smaller than the preset user BWP bandwidth, starting frequency hopping, otherwise, not frequency hopping.

306, determining the number N of the second SRS symbols of the user according to the moving speed of the user_symbol-ue-vAnd a second SRS period T of the user_ue-v. When the Channel changes rapidly and the SRS is used for downlink beam forming or uplink CQI (Channel Quality Indicator) measurement AMC (Adaptive Modulation and Coding), mode switching, beam management, or other purposes, the validity of the SRS measurement information needs to be ensured, and the number N of the second SRS symbols of the user is determined according to the shortest SRS time requirement and the determined bandwidth required by the user_symbol-ue-vAnd a second SRS period T of the user_ue-v(milliseconds). Wherein, the valid duration Delay (sec) of the SRS is assumed to be:

Delay/floor(N_symbol-ue-v/T_ue-v)≥/ceiling(BWP_ue/M*R)

determining the number of symbols N required by the user_ueThe method comprises the following steps:

307, determining the number of symbols N required by the user_ueThe first substep of (A) is:

N_symbol-ue＝max{N_symbol-ue-v，N_{symbol-ue-5qi}}

308, determining the number N of symbols required by the user_ueThe second substep of (2) is:

N_ue＝min(N_symbol-ue，N_symbol-cell)

309, determining a user demand period T_ueComprises the following steps:

T_ue＝min{T_srs-cell，T_ue-5qi，T_ue-v}

in the embodiment of the invention, the pre-estimated SRS resource of a cell and the target service delay requirement of a user terminal in the cell are determined; determining the SRS resource of the user by adopting the target service delay requirement of the user terminal on the basis of the user number capacity of the cell, the moving speed of the user and the measurement signal-to-noise ratio requirement of the SRS signal; adopting a cell to estimate SRS resources and adjust the SRS resources of users; the adjusted SRS resource of the user is distributed to the user terminal, the SRS resource of the user is distributed from three dimensions of SRS frequency domain resource, SRS period and SRS symbol number, and the time delay requirement of the user terminal with high time delay requirement service in the service initial stage and the service continuous stage in the 5G NR system can be effectively met, so that the user perception is ensured.

It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.

Referring to fig. 7, a block diagram of a structure of an embodiment of an SRS resource allocation apparatus according to the present invention is shown, and specifically includes the following modules:

a cell SRS resource estimation module 401, configured to determine an estimated SRS resource of a cell;

a service delay requirement determining module 402, configured to determine a target service delay requirement of a user terminal in a cell;

a user SRS resource initial determining module 403, configured to determine a user SRS resource according to a target service delay requirement of a user terminal;

a trigger setting module 404, configured to set a trigger condition;

a trigger executing module 405, configured to invoke the user SRS resource adjusting module when a trigger condition is met.

A user SRS resource adjusting module 406, configured to adjust the user SRS resource by using the cell pre-estimated SRS resource;

and a module 407 for allocating the adjusted SRS resource to the ue.

On the basis of fig. 7, optionally, referring to fig. 8, the cell SRS resource estimation module 401 may specifically include the following sub-modules:

the cell information obtaining submodule 4011 is configured to obtain cell capacity, cell basic delay requirements, and cell channel quality requirements;

the cell theoretical SRS resource calculation submodule 4012 is used for calculating the number of cell SRS theoretical symbols and the cell SRS theoretical period by adopting the cell capacity, the cell basic delay requirement and the cell channel quality requirement;

the cell SRS prediction resource determining submodule 4013 is configured to determine the number of cell SRS prediction symbols and the cell SRS prediction period by using the number of cell SRS theoretical symbols, the cell SRS theoretical period, and a preset margin factor.

In this embodiment of the present invention, the service delay requirement determining module may include the following sub-modules:

a service delay obtaining sub-module 4021, configured to obtain at least one service delay requirement of a user equipment in a cell;

and the target service delay determining submodule 4022 is configured to determine the service delay requirement with the lowest delay as the target service delay requirement.

In this embodiment of the present invention, the user SRS resource adjusting module 406 may include the following sub-modules:

a user terminal information obtaining submodule 4061, configured to obtain a moving speed and a quality requirement of a service channel of the user terminal;

a service channel quality requirement processing submodule 4062, configured to determine a second SRS bandwidth of the user by using the service channel quality requirement of the user terminal;

a user required bandwidth determining submodule 4063, configured to determine a user required bandwidth by using the first SRS bandwidth of the user and the second SRS bandwidth of the user;

the moving speed processing submodule 4064 is configured to obtain a second SRS symbol number of the user and a second SRS period of the user by using the moving speed of the user terminal;

a user demand symbol number determining submodule 4065, configured to determine a user demand symbol number by using a user second SRS symbol number of the user terminal;

the user requirement period determining sub-module 4066 is configured to determine a user requirement period by using a second SRS period of the user terminal.

In this embodiment of the present invention, the user required bandwidth determining sub-module 4063 may include the following units:

a user bandwidth maximum value determining unit, configured to determine a bandwidth maximum value in a first SRS bandwidth of a user and a second SRS bandwidth of the user;

In this embodiment of the present invention, the user requirement symbol number determining sub-module 4065 may include the following units:

In this embodiment of the present invention, the user requirement cycle determining sub-module 4066 may include the following units:

the user minimum value period determining unit is used for determining the minimum value of periods in the SRS pre-estimation period, the first SRS period and the second SRS period of the user;

and the user demand period determining unit is used for determining the minimum period value as the user demand period.

In the embodiment of the invention, the target service delay requirement of the user terminal is the highest delay requirement of a plurality of services of the user terminal.

In this embodiment of the present invention, the module 406 for adjusting SRS resources of a user further includes:

the frequency hopping judging submodule 4067 is used for judging whether the bandwidth required by the user is smaller than the preset bandwidth of the user BWP;

and the frequency hopping execution sub-module 4068 is configured to start a bandwidth frequency hopping mode when the bandwidth required by the user is smaller than a preset user BWP bandwidth.

For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the system embodiment.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.

The SRS resource allocation method and the SRS resource allocation device provided by the present invention are described in detail above, and specific examples are applied herein to illustrate the principles and embodiments of the present invention, and the description of the above embodiments is only used to help understanding the method and the core ideas of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A method for allocating SRS resources is characterized in that the method comprises the following steps:

determining a pre-estimated SRS resource of a cell;

adopting the cell to predict SRS resources to adjust the user SRS resources;

and allocating the adjusted SRS resource of the user to the user terminal.

2. The method of claim 1, wherein the estimated SRS resources of the cell include a number of estimated symbols of the SRS of the cell and an estimated period of the SRS of the cell, and wherein the step of determining the estimated SRS resources of the cell includes:

3. The method of claim 2, wherein the user SRS resources include a user first SRS symbol number, a user first SRS period, and a user first SRS bandwidth.

4. The method of claim 3, wherein the step of adjusting SRS resources of users using the predicted SRS resources of the cell comprises:

5. The method of claim 4, wherein the step of determining a user required bandwidth using the user first SRS bandwidth and the user second SRS bandwidth comprises:

and determining the maximum bandwidth as the bandwidth required by the user.

6. The method of claim 5, wherein after the step of determining a user required bandwidth using the user first SRS bandwidth and the user second SRS bandwidth, further comprising:

and if so, starting a bandwidth frequency hopping mode.

7. The method according to claim 5 or 6, wherein the step of determining the number of user required symbols using the second number of SRS symbols of the user terminal comprises:

8. The method of claim 7, wherein the step of determining the user requirement period using the second SRS period for the user of the user terminal comprises:

and determining the minimum period value as a user demand period.

9. The method of any of claims 1-6, 8, wherein the step of determining the target traffic delay requirement for the user terminals in the cell comprises:

10. The method of claim 9, wherein prior to the step of adjusting the user SRS resources using the predicted SRS resources from the cell, further comprising:

setting a trigger condition;

11. An apparatus for allocating channel Sounding Reference Signal (SRS) resources, the apparatus comprising:

12. The apparatus of claim 11, wherein the estimated SRS resources of the cell include estimated symbol number of SRS of the cell and estimated period of SRS of the cell, and wherein the module for estimating SRS resources of the cell includes:

13. The apparatus of claim 12, wherein the user SRS resources comprise a first number of SRS symbols for a user, a first SRS period for a user, and a first SRS bandwidth for a user.

14. The apparatus of claim 13, wherein the user SRS resource adjustment module comprises:

15. The apparatus of claim 14 wherein said user required bandwidth determination submodule comprises:

16. The apparatus of claim 15, wherein the user SRS resource adjusting module further comprises:

17. The apparatus according to claim 15 or 16, wherein the user requirement symbol number determination submodule comprises:

18. The apparatus of claim 17 wherein said user demand cycle determination submodule comprises:

19. The apparatus according to any of claims 11-16, 18, wherein the traffic delay requirement determining module comprises:

20. The apparatus of claim 19, further comprising:

the trigger setting module is used for setting trigger conditions;