CN111918400B - SRS resource allocation method and device - Google Patents

SRS resource allocation method and device Download PDF

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Publication number
CN111918400B
CN111918400B CN201910376846.8A CN201910376846A CN111918400B CN 111918400 B CN111918400 B CN 111918400B CN 201910376846 A CN201910376846 A CN 201910376846A CN 111918400 B CN111918400 B CN 111918400B
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user
srs
cell
determining
bandwidth
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CN111918400A (en
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蒋一鸣
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority

Abstract

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

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, channel sounding reference signal) is mainly used as uplink channel sounding to enable the network side to acquire uplink CQI (Channel Quality Indicator ) information of the UE (User Equipment) and downlink shaping information.
The existing LTE (Long Term Evolution ) network architecture generally considers the cell user terminal capacity, the moving speed of the user terminal and the measurement signal-to-noise ratio requirement of the SRS signal when configuring the SRS time-frequency domain resource for the UE. When the number of the user terminals is small, larger frequency domain resources and smaller periods are allocated to the user terminals; when the number of the user terminals is more, smaller frequency domain resources and larger periods are allocated to the user terminals; when the moving speed of the user terminal is slower, a larger SRS period can be allocated to the user terminal, but once the moving speed of the user terminal is faster, 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 better, larger SRS frequency domain resources (longer SRS sequences) can be allocated to the user terminal so as to obtain better channel estimation performance, and when the channel state of the user terminal is poorer, the number of PRBs (Physical Resource Block, physical resource blocks) allocated to the SRS needs to consider the transmitting power of the user terminal, if too many PRBs are allocated, the receiving power on a single PRB is reduced, and the channel estimation is not facilitated.
Modern mobile communication is increasingly tending to provide multimedia services for high rate transmission, and 5G technology has become the main research area for modern mobile communication. When a base station in a 5G NR (New Radio) system allocates SRS time-frequency domain resources to UEs, it generally considers cell user terminal capacity, user terminal power limitation, and channel variation conditions to determine allocation of frequency domain resources (including whether frequency domain hopping granularity is or not) and time domain periods. Unlike LTE systems, for example, the real Reality (Virtual Reality VR) service in 5G, the real-time information transmission of the internet of vehicles, the remote control service, etc., the end-to-end service delay requirement reaches 10ms or even 5ms, while the common eMBB (Enhance Mobile Broadband, enhanced mobile broadband) frame structure has 1 self-contained slot for transmitting the uplink SRS signal only 5ms or 2.5ms, and if the complete SRS signal cannot be transmitted within one period (5 ms or 2.5 ms) to detect the complete bandwidth, the measurement of the quality of the uplink channel and the transmission time point of the downlink service may be affected, so that the high delay requirement of the service is not satisfied, and the user perception cannot be ensured.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide an SRS resource allocation method so as to meet the high delay requirement of the service and ensure the perception of the user.
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 problems, the invention discloses an SRS resource allocation method, which specifically comprises the following steps:
determining estimated SRS resources of a cell;
determining a target service delay requirement of a user terminal in the cell;
determining a user SRS resource by adopting a target service delay requirement of the user terminal;
adjusting the SRS resources of the user by adopting the district estimated SRS resources;
and distributing the adjusted user SRS resources to the user terminal.
Preferably, the estimated SRS resource of the cell includes a number of estimated SRS symbols of the cell and an estimated SRS period of the cell, and the step of determining the estimated SRS resource of the cell includes:
acquiring cell capacity, cell basic delay requirement and cell channel quality requirement;
calculating the theoretical symbol number of the SRS of the cell and the theoretical period of the SRS of the cell by adopting the cell capacity, the cell basic 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 user SRS resource includes a number of user first SRS symbols, a user first SRS period, and a user first SRS bandwidth.
Preferably, the step of adjusting the SRS resource of the user by using the estimated SRS resource of the cell 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 user required bandwidth by adopting the first SRS bandwidth of the user and the second SRS bandwidth of the user;
acquiring a second SRS symbol number of a user and a second SRS period of the user by adopting the moving speed of the user terminal;
determining the number of user demand symbols by adopting the number of the user second SRS symbols;
and determining a user demand period by adopting the user second SRS period.
Preferably, the step of determining the user required bandwidth 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 of the user and the second SRS bandwidth of the user;
and determining the maximum bandwidth value as the bandwidth required by the user.
Preferably, after the step of determining the user required bandwidth by using the user first SRS bandwidth and the user second SRS bandwidth, the method further includes:
Judging whether the user demand bandwidth is smaller than a preset user BWP bandwidth or not;
if yes, the bandwidth hopping mode is started.
Preferably, the step of determining the number of user required symbols by using the number of user second SRS symbols 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 a user undetermined symbol number;
and determining the minimum value of the number of the undetermined symbols of the user and the estimated number of the SRS of the cell as the number of the symbols required by the user.
Preferably, the step of determining the user demand period by using the user second SRS period includes:
determining a period minimum value of the district SRS estimated period, the user first SRS period and the user second SRS period;
and determining the minimum period as the user demand period.
Preferably, the step of determining the target service delay requirement of the user terminal in the cell includes:
acquiring service delay requirements of at least one user terminal in the cell;
and determining the service delay requirement with the lowest delay as a target service delay requirement.
Preferably, before the step of adjusting the SRS resource of the user using the estimated SRS resource of the cell, the method further includes:
Setting a triggering condition;
and when the triggering condition is met, executing the step of adopting the cell estimated SRS resource to adjust the user SRS resource.
The embodiment of the invention also provides an SRS resource allocation device, which specifically comprises:
the district SRS resource estimating module is used for determining the estimated SRS resource of the district;
a service delay requirement determining module, configured to determine a target service delay requirement of a user terminal in the cell;
the initial user SRS resource determining module is used for determining user SRS resources by adopting the target service delay requirement of the user terminal;
a user SRS resource adjustment module, configured to adjust the user SRS resource by using the cell estimated SRS resource;
and the user terminal module is used for distributing the adjusted user SRS resources to the user terminal.
Preferably, the estimated SRS resource of the cell includes a number of estimated SRS symbols of the cell and an estimated SRS period of the cell, and the estimated SRS resource module of the cell includes:
the cell information acquisition sub-module is used for acquiring cell capacity, cell basic delay requirement and cell channel quality requirement;
the cell theory SRS resource calculation sub-module is used for calculating the number of the 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;
And the cell estimated SRS resource determining submodule is used for determining the number of the cell SRS estimated symbols and the cell SRS estimated period by adopting the number of the cell SRS theoretical symbols, the cell SRS theoretical period and a preset margin factor.
Preferably, the user SRS resource includes a number of user first SRS symbols, a user first SRS period, and a user first SRS bandwidth.
Preferably, the user SRS resource adjustment module includes:
a user terminal information acquisition sub-module for acquiring the moving speed of the user terminal and the quality requirement of a service channel;
a service channel quality requirement processing sub-module, configured to determine a second SRS bandwidth of a user using the service channel quality requirement of the user terminal;
a user required bandwidth determining sub-module, configured to determine a user required bandwidth by using the user first SRS bandwidth and the user second SRS bandwidth;
a mobile speed processing sub-module, configured to acquire a second SRS symbol number of a user and a second SRS period of the user by using the mobile 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 demand period determination submodule is used for determining the user demand period by adopting the user second SRS period.
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 demand bandwidth determining unit is used for determining the maximum bandwidth value as the user demand bandwidth.
Preferably, the user SRS resource adjustment module further includes:
the frequency hopping judging sub-module is used for judging whether the bandwidth required by the user is smaller than a preset user BWP bandwidth or not;
and the frequency hopping execution sub-module is used for starting a bandwidth frequency hopping mode when the bandwidth required by the user is smaller than the preset BWP bandwidth of the user.
Preferably, the user demand symbol number determining submodule includes:
a user pending symbol number determining unit, configured to determine a maximum value of the user first SRS symbol number and the user second SRS symbol number as a user pending symbol number;
and the user demand symbol number determining unit is used for determining the minimum value in the number of the user undetermined symbols and the estimated number of the district SRS as the number of the user demand symbols.
Preferably, the user demand period determination submodule includes:
a user minimum period determining unit, configured to determine a period minimum of the cell SRS estimation period, the user first SRS period, and the user second SRS period;
And the user demand period determining unit is used for determining the period minimum value as the user demand period.
Preferably, the service delay requirement determining module includes:
a service delay obtaining sub-module, configured to obtain a service delay requirement of at least one user terminal in the cell;
and the target service delay determining sub-module 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 user SRS resource is determined by determining the estimated SRS resource of 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; and adjusting the SRS resources of the user by combining the estimated SRS resources of the cell; the adjusted user SRS resources are distributed to the user terminals, so that the user terminals with high time delay requirement service in the 5G NR system can be effectively ensured, and the time delay requirements in the initial stage and the continuous stage of the service can be met, thereby ensuring user perception.
Drawings
Fig. 1 is a schematic diagram of possible transmission positions of SRS within a slot;
FIG. 2 is a schematic diagram of an NR representative frame structure;
FIG. 3 is a schematic diagram of another NR representative frame structure;
FIG. 4 is a flowchart illustrating steps of an embodiment of a SRS resource allocation method according to the present invention;
FIG. 5 is a flowchart illustrating steps of another embodiment of an SRS resource allocation method of the present invention;
FIG. 6 is a flowchart illustrating steps of an embodiment of a SRS resource allocation method according to the present invention;
fig. 7 is a block diagram illustrating an embodiment of an SRS resource allocation apparatus according to the present invention;
fig. 8 is a block diagram illustrating a structure of another SRS resource allocation apparatus according to an embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
For convenience of description of the subsequent examples, the 5G NR systemThe SRS resource allocation in the system is introduced: the uplink SRS signal may be {1,2,4} ports in the NR system, and the starting symbol position of the SRS may be at the last 6 uplink OFDM (Orthogonal Frequency Division Multiplexing ) symbol positions of a certain uplink time slot or a self-contained time slot, that is, the SRS resource may be configured as ns= {1,2,4} consecutive OFDM symbols, where the time domain position is the last 6 symbols of a time slot, where each symbol on the SRS resource is mapped to all antenna ports. For a given SRS Resource, the repetition factor R E {1,2,4} is configured by the higher-layer parameter SRS-Resource Mapping, and R.ltoreq.Ns. When the SRS resources within each slot are not configured with frequency hopping (r=ns), then on each OFDM symbol, all antenna ports are mapped onto the same set of subcarriers occupying the same PRB; when the hopping is configured and not repeated (r=1), the hopping parameter C is hopped according to SRS SRS B SRS b hop (see section 6.4.1.4.3 of protocol 38.211) within each OFDM symbol, all antenna ports are mapped to different sets of subcarriers, where these different subcarriers use the same comb (comb tooth) values; when both the hopping and repetition factors are configured, such as ns=4, r=2, then within each pair of R consecutive OFDM symbols, all antenna ports are mapped onto the same set of subcarriers, hopping between each pair of symbols according to SRS hopping parameters.
The SRS may perform intra-slot frequency hopping and inter-slot frequency hopping in one BWP (Band Width Part).
The aperiodic SRS resource may be configured to Ns as 2or4 consecutive symbols, frequency hopping is performed in intra-slot time slot in one BWP, and when frequency hopping is configured and r=1, during Ns symbols, the entire frequency hopping bandwidth is detected in BWP, and each time the detected subband has the same size. The UE may configure an aperiodic SRS resource with ns=4 consecutive symbols, perform intra-slot frequency hopping in one BWP, and when R is configured to be 2, the entire frequency hopping bandwidth in the BWP is detected 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 periodic or semi-static SRS resources, ns=1 symbol may be configured, and inter-slot frequency hopping is performed in one BWP, where symbol positions occupied by SRS resources in each slot are the same. Possible transmission positions of SRS within a slot are shown with reference to fig. 1.
On the periodic or semi-static SRS resource, ns=2or 4 consecutive symbols may also be configured, and intra-slot and inter-slot frequency hopping may be performed in one BWP, where the Ns symbols occupied by the SRS resource in each slot have the same position. For example ns=4, when frequency hopping is configured and r=2, intra-slot and inter-slot frequency hopping is supported, all antenna ports are mapped on different subcarrier sets between two pairs of R consecutive symbols in each slot, and all antenna ports are mapped on the same subcarrier set within each pair of R consecutive symbols. 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 periodic 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 steps of a first embodiment of an SRS resource allocation method according to the present invention may include the following steps:
step 101, determining estimated SRS resources of the cell.
In this step, the system side determines the estimated SRS resource of the cell, mainly determines the requirement of the cell-level SRS resource, and prepares for the 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, and the invention performs SRS resource allocation for the target service delay requirements of different user terminals, and researches a single user terminal as an object, and the SRS resource allocation scheme of each user terminal executes the method of the embodiment of the invention, specifically, the method of simultaneously allocating or allocating in priority one by one, which is not limited in the invention.
And step 103, determining the SRS resource of the user by adopting the target service delay requirement of the user terminal.
In this step, the SRS resource of the user is calculated according to the target service delay requirement of the user terminal, in the 5G NR system, each user may establish a plurality of DRBs ((user) Data Radio Bearer, (user level) data bearers), each bearer has different 5QI (5 th Qos flow Index) attributes, and the SRS time-frequency domain resource of the user is determined according to the target service delay requirement of the user terminal.
And step 104, adjusting the SRS resources of the user by adopting the district estimated SRS resources.
In this step, the SRS resources include period, frequency hopping bandwidth, and number of symbols, and in the process of SRS resource processing and allocation, the processing method, processing sequence, processing parameters, boundary conditions, or constraint conditions can be automatically adjusted according to the characteristics of the SRS resources, so that the SRS resources are adapted to the statistical distribution characteristics and structural characteristics of the processed resource data, so as to obtain the process of optimal processing effect, and make SRS resource allocation of the user more reasonable.
And step 105, the adjusted user SRS resources are distributed to the user terminal.
In this step, the user terminal is a terminal device capable of being connected to a communication network, and can realize transmission and sending of data signals, which can be a mobile phone, a computer, an iPad, etc., in the embodiment of the present invention, the connectable communication network mainly refers to a 5G network. Generally, after adjusting the user SRS resource, the embodiment of the present invention allocates the adjusted user SRS resource to the user terminal through the 5G network.
In the embodiment of the invention, the user SRS resource is determined by determining the estimated SRS resource of 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; and adjusting the SRS resources of the user by combining the estimated SRS resources of the cell; the adjusted user SRS resources are distributed to the user terminals, so that the time delay requirements of the user terminals with high time delay service in the 5G NR system in the initial stage and the continuous stage of the service can be met, and user perception is guaranteed.
Referring to fig. 5, a flowchart illustrating steps of a second embodiment of an SRS resource allocation method according to the present invention may include the following steps:
step 201, determining estimated SRS resources of a cell.
In general, the estimated SRS resources at the cell level may include the number of estimated symbols of the cell SRS and the estimated period of the cell SRS.
In a preferred embodiment of the present invention, the step of determining the estimated SRS resource of the cell may comprise the sub-steps of:
sub-step 2011, obtaining the cell capacity, the cell basic delay requirement and the cell channel quality requirement.
Sub-step 2012, calculating the number of theoretical symbols of the SRS of the cell and the theoretical period of the SRS of the cell by using the cell capacity, the basic delay requirement of the cell and the channel quality requirement of the cell.
Sub-step 2013, determining the number of estimated symbols of the cell SRS and the estimated period of the cell SRS by adopting the number of theoretical symbols of the cell SRS, the theoretical period of the cell SRS and a preset margin factor.
The system side firstly calculates a basic theoretical SRS requirement on the basis of the cell capacity requirement, the basic service delay requirement and the basic channel measurement effectiveness requirement, wherein the basic theoretical SRS requirement can be a statistical average value or a statistical minimum value, and then considers a certain margin factor on the basis of the basic theoretical SRS requirement to determine the estimated requirement of the cell-level SRS resource. In the following, for example, according to the basic average moving speed of the user terminal of the cell of 30km/h and the service delay requirement of 100ms, each user terminal is configured with 2 theoretical OFDM symbols, the basic user terminal requirement of the cell (such as 400 or 1200 connected user terminals) is calculated, M theoretical OFDM symbols are required to be configured in 1s, the actually configured SRS resource is the number of the theoretical OFDM symbols of the SRS multiplied by a certain estimated margin factor α, and the calculation method of the estimated period of the SRS of the cell is similar, where α can be configured to be 1.3-1.5.
Step 202, determining target service delay requirement of user terminal in cell.
In step 202, each ue generally has a plurality of services, and the delay requirements of each service may be different, so as to meet the delay requirement of the ue as much as possible.
Thus, most preferably, this step 202 may comprise the following sub-steps:
sub-step 2021, obtaining a service delay requirement of at least one user terminal in the cell;
sub-step 2022, determining the service latency requirement with the lowest latency as the target service latency requirement.
In step 203, the SRS resource of the user is determined by using the target service delay requirement of the user terminal.
In step 203, the user SRS resources may include a number of user first SRS symbols, a user first SRS period, and a user first SRS bandwidth.
Step 204, setting a trigger condition.
In the embodiment of the invention, the triggering condition can be set as periodic triggering, and when a preset adjusting period is reached, the triggering is automatically triggered to realize the dynamic adjustment of the SRS resource of the user terminal. Further, the trigger condition may be set from the perspective of SRS frequency domain PRB (Physical Resource Block ), SRS period, SRS OFDM symbol number, and the like. For example, the dynamic resource allocation process can be triggered according to the uplink measured UE channel quality meeting the preset trigger condition or when the moving speed of the UE reaches the preset trigger condition.
Step 205, judging whether the current state meets the triggering condition, and executing step 206 when the triggering condition is met.
And 206, adjusting the SRS resources of the user by adopting the district estimated SRS resources.
In the embodiment of the invention, the hop bandwidth of the SRS resource of the user needs to consider the initial or actual activation of the user, and the allocated bandwidth resource can be the bandwidth of not the whole cell according to the actual adjustment.
In a preferred embodiment of the present invention, this step 206 may comprise the following sub-steps:
sub-step 2061, obtaining the movement speed of the user terminal and the traffic channel quality requirement.
Sub-step 2062, determining the user second SRS bandwidth using the traffic channel quality requirement of the user terminal.
In this substep 2062, the second SRS bandwidth is determined according to the channel quality of the ue, and the power level for the single PRB (Physical Resource Block ) transmission of the ue is calculated according to the target SINR (Signal to Interference plus Noise Ratio ) and the path loss information. For power limited users, the number of PRBs needs to be reduced and the PSD (power spectral density ) increased to ensure that the received SINR meets the requirements. For the users with unrestricted power, the actual scheduling PRB can be used, the PRB can be expanded, and the measurement performance is improved by using a longer SRS sequence.
Sub-step 2063, determining the user desired bandwidth using the user first SRS bandwidth and the user second SRS bandwidth.
In this sub-step 2063, a bandwidth maximum of the user first SRS bandwidth and the user second SRS bandwidth may be determined first; the bandwidth maximum is then determined as the user demand bandwidth.
And after sub-step 2063, as another preferred embodiment, when the user required bandwidth is determined, it may be determined whether the calculated user required bandwidth is less than the 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 mode commonly used in wireless communication, and the working principle is that the carrier frequencies of signals transmitted by the transmitting and receiving parties are discretely changed according to a preset rule. That is, the carrier frequency used in communication is randomly hopped under the control of a pseudo-random variation code. In terms of implementation of the communication technology, the frequency hopping technology is a communication mode in which multiple frequency shift keying is performed using a code sequence. From a signal spectrum perspective, frequency hopping signals typically occupy a wide frequency band. In this communication mode, the radio frequency bandwidth used for signal transmission is several tens of times, hundreds of times or even thousands of times the original signal bandwidth. But only for a certain moment it only works at a certain frequency.
The frequency hopping is to automatically control all stations in the network to synchronously change the frequency for a plurality of times within one second according to a preset program of the whole network, and to temporarily stop on each frequency hopping channel. Periodic synchronization signaling is sent from the master station to instruct all the slave stations to change the operating frequency in a skip manner at the same time. Frequency hopping techniques are employed to ensure the confidentiality and interference immunity of the communication. Frequency hopping communications are also more difficult to intercept than fixed frequency communications. It is difficult to intercept the communication contents of my party as long as the rule of carrier frequency hopping is not clear to the other party. Meanwhile, the frequency hopping communication also has good anti-interference capability, and even if part of frequency points are interfered, normal communication can be performed on other frequency points which are not interfered.
Sub-step 2064, obtaining the number of user second SRS symbols and the user second SRS period using the moving speed of the user terminal.
Sub-step 2065, determining the number of user desired symbols using the number of user second SRS symbols for the user terminal.
In this sub-step 2065, the maximum of the number of user first SRS symbols and the number of user second SRS symbols may be determined as the number of user pending symbols; and then determining the minimum value of the number of the undetermined symbols of the user and the estimated number of the SRS of the cell as the number of the symbols required by the user.
Sub-step 2066, determining the user demand period using the user second SRS period of the user terminal.
In this sub-step 2066, a period minimum of the SRS prediction period, the first SRS period, and the user second SRS period may be determined first; and then determining the minimum period value as the user demand period.
When the channel changes rapidly, SRS resources are used for downlink beamforming or uplink CQI (Channel Quality Indicator, channel quality indication) measurement AMC (Adaptive Modulation and Coding ) adjustment, mode switching or beam management, etc., the SRS measurement information validity needs to be guaranteed.
Step 207, the adjusted user SRS resource is allocated to the user terminal.
In order that those skilled in the art may better understand the embodiments of the present invention, a specific example will be described below, but it should be understood that the embodiments of the present invention are not limited thereto.
The embodiment of the invention combines the requirement of the user on 5QI time delay, the requirement of the channel quality SNR and the requirement of the moving speed to comprehensively determine the SRS bandwidth, the SRS symbol number and the period of the user. For convenience of description, referring to fig. 6, the steps in this specific example will not be classified completely according to the steps of the above embodiments.
301, the system side calculates a basic SRS requirement based on the cell capacity requirement and the basic service delay requirement, and the basic channel measurement availability requirement (the basic requirement may be a statistical average value or a minimum value), and determines the requirement N of the cell-level SRS resource by considering a certain margin factor on the basis symbol-cell And T srs_cell . For example, according to an average moving speed of 30km/h and a service delay requirement of 100ms, each user configures 2 OFDM symbols, an actual cell user requirement (such as 400 or 1200 connected users) calculates the number of theoretical symbols of the SRS of M cells to be configured in 1s, and the final number of estimated symbols of the SRS of the cell to be actually estimated and configured is:
N symbol-cell ＝M*α
wherein, alpha is SRS resource estimated margin factor, which can be configured to be 1.3-1.5.
Each user terminal in 302,5G NR can establish multiple DRB bearers, each bearer has different 5QI attributes, and the SRS time-frequency domain resource of the user is determined according to the service type with highest time delay requirement of multiple services of the user terminal, including the first SRS period T of the user ue-5qi (millisecond), user first SRS Bandwidth M prb-ue-5qi Number of user first SRS symbols N symbol-ue-5qi 。
Wherein, the minimum time delay (seconds) of the service processing is as follows:
D＝min{D ue-5qi,j }
wherein the method comprises the steps of，D ue-5qi,j And 5QI time delay requirements are required for different services of the user terminal.
The preset UE BWP bandwidth is BWP ue And if the SRS repetition factor is R, the number of SRS symbols in 1s is:
floor(N symbol-ue-5qi /T ue-5qi )
the number of OFDM symbols required for the UE to traverse BWP is:
ceiling(BWP ue /M prb-ue-5qi )*R
at the same time, the requirements are as follows:
D/floor(N symbol-ue-5qi /T ue-5qi )≥ceiling(BWP ue /M prb-ue-5qi )*R
the bandwidth needs to take into account the user initial BWP or the actually activated BWP at this time, and may not be the entire cell bandwidth.
303, the triggering condition is set to be periodically triggered according to the moving speed of the user terminal and the change of the user channel quality, and further, the triggering condition can also be triggered when the uplink measured UE channel quality or the calculated moving speed of the user terminal meets a certain preset condition, so that the updating process of dynamic resource allocation is realized. For example, the calculated SRS user required bandwidth to be transmitted to the user starts frequency hopping when the user required bandwidth is smaller than the BWP bandwidth preset by the user, otherwise does not hop.
304, determining the user second SRS bandwidth M according to the user channel quality prb-ue-snr The power level of the single PRB (Physical Resource Block ) transmission of the terminal can be calculated according to the received target SINR (Signal to Interference plus Noise Ratio, signal-to-interference-and-noise ratio) and the path loss information, and for poor users, the number of PRBs needs to be reduced to M under the condition of limited power prb-ue-snr Increasing the PSD (power spectral density ) ensures that the received SINR meets the requirements. Better users can use actual scheduled PRBs as M prb-ue-snr The prb can be expanded to M in the situation that the user power is not limited prb-ue-snr The measurement performance is improved by using a longer SRS sequence.
305, determining the transmitted user demand bandwidth M ue The method comprises the following steps:
M ue ＝max{M prb-ue-snr ，M prb-ue-5qi }
when M ue And starting frequency hopping when the bandwidth is smaller than the preset BWP bandwidth of the user, 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-v And user second SRS period T ue-v . When the channel changes rapidly, the SRS is used for the purposes of downlink beamforming or uplink CQI (Channel Quality Indicator, channel quality indication) measurement AMC (Adaptive Modulation and Coding ) adjustment or mode switching or beam management, etc., the SRS measurement information validity needs to be ensured, and the second SRS symbol number N of the user is determined according to the shortest SRS time requirement and the determined user requirement bandwidth symbol-ue-v And user second SRS period T ue-v (milliseconds). Wherein, the SRS effective duration Delay (seconds) is assumed to be:
Delay/floor(N symbol-ue-v /T ue-v )≥/ceiling(BWP ue /M*R)
determining a user demand symbol number N ue The method comprises the following steps:
307, determining the number N of user demand symbols ue The first step of (2) is:
N symbol-ue ＝max{N symbol-ue-v ，N symbol-ue-5qi }
308, determining the number N of user demand symbols ue The second step of (2) is:
N ue ＝min(N symbol-ue ，N symbol-cell )
309, determining a user demand period T ue The method comprises the following steps:
T ue ＝min{T srs-cell ，T ue-5qi ，T ue-v }
in the embodiment of the invention, the estimated SRS resource of the cell and the target service delay requirement of the user terminal in the cell are determined; determining SRS resources of a user by adopting target service time delay requirements of a user terminal on the basis of the user capacity of a cell, the moving speed of the user and the measurement signal to noise ratio requirements of SRS signals; adjusting the SRS resources of the user by adopting the district estimated SRS resources; and the adjusted user SRS resources are distributed to the user terminals, so that the SRS resources of the users are distributed from three dimensions of SRS frequency domain resources, SRS period and SRS symbol number, the time delay requirements of the user terminals with high time delay requirement services in the 5G NR system can be effectively ensured, and the time delay requirements in the initial stage and the continuous stage of the services can be met, thereby ensuring the user perception.
It should be noted that, for simplicity of description, the method embodiments are shown as a series of acts, but it should be understood by those skilled in the art that the embodiments are not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required by the embodiments of the invention.
Referring to fig. 7, one of the structural block diagrams of an embodiment of an SRS resource allocation apparatus according to the present invention may specifically include 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 primary user SRS resource determining module 403, configured to determine a user SRS resource by using a target service delay requirement of a user terminal;
a trigger setting module 404, configured to set a trigger condition;
and the trigger execution module 405 is configured to invoke the user SRS resource adjustment module when the trigger condition is satisfied.
A user SRS resource adjustment module 406, configured to adjust the user SRS resource by using the cell estimated SRS resource;
to the user terminal module 407, for allocating the adjusted SRS resources to the user terminal.
Optionally, referring to fig. 8, the cell SRS resource estimation module 401 may specifically include the following sub-modules on the basis of fig. 7:
a cell information obtaining submodule 4011, configured to obtain a cell capacity, a cell basic delay requirement and a cell channel quality requirement;
a cell theory SRS resource calculation submodule 4012, configured to calculate a number of cell SRS theoretical symbols and a cell SRS theoretical period by using a cell capacity, a cell basic delay requirement and a cell channel quality requirement;
the cell estimated SRS resource determining submodule 4013 is configured to determine the number of cell SRS estimated symbols and the cell SRS estimated period by using the number of cell SRS theoretical symbols, the cell SRS theoretical period and a preset margin factor.
In the embodiment of the invention, the service delay requirement determining module may include the following sub-modules:
a service delay acquisition submodule 4021, configured to acquire a service delay requirement of at least one user terminal in a cell;
the target service delay determination submodule 4022 is configured to determine a service delay requirement with the lowest delay as a target service delay requirement.
In the embodiment of the present invention, the user SRS resource adjustment module 406 may include the following sub-modules:
a user terminal information obtaining sub-module 4061, configured to obtain a movement speed and a service channel quality requirement of the user terminal;
a traffic channel quality requirement processing sub-module 4062, configured to determine a second SRS bandwidth of the user by using the traffic 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;
a moving speed processing submodule 4064, configured to acquire the number of second SRS symbols of the user and the second SRS period of the user by using the moving speed of the user terminal;
a user requirement symbol number determining submodule 4065, configured to determine a user requirement symbol number by using the second SRS symbol number of the user terminal;
a user demand period determination submodule 4066 for determining a user demand period using the user second SRS period of the user terminal.
In an embodiment of the present invention, the user demand bandwidth determination submodule 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;
And the user demand bandwidth determining unit is used for determining the maximum bandwidth value as the user demand bandwidth.
In an embodiment of the present invention, the user requirement symbol number determination submodule 4065 may include the following units:
the user pending 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 pending symbol number;
and the user demand symbol number determining unit is used for determining the minimum value of the number of the undetermined symbols of the user and the estimated number of the SRS of the cell as the user demand symbol number.
In an embodiment of the present invention, the user demand cycle determination submodule 4066 may include the following units:
a user minimum period determining unit, configured to determine a period minimum of the SRS estimation period, the first SRS period, and the user second SRS period;
and the user demand period determining unit is used for determining the period minimum 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 the embodiment of the present invention, the user SRS resource adjustment module 406 further includes:
a frequency hopping judging submodule 4067, configured to judge whether the bandwidth required by the user is smaller than a preset user BWP bandwidth;
The frequency hopping execution submodule 4068 is configured to turn on the frequency hopping mode for the bandwidth when the bandwidth required by the user is smaller than the preset bandwidth of the BWP.
For the device embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference is made to the partial description of the system embodiment for relevant points.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It will be apparent to those skilled in the art that 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 invention may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, 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 apparatus 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 apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus 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 in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The above detailed description of an SRS resource allocation method and an SRS resource allocation apparatus provided by the present invention applies specific examples to illustrate the principles and embodiments of the present invention, and the description of the above examples is only for helping to understand the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.

Claims (18)

1. A method for allocating SRS resources for a channel sounding reference signal, the method comprising:
determining estimated SRS resources of a cell;
determining a target service delay requirement of a user terminal in the cell;
determining a user SRS resource by adopting a target service delay requirement of the user terminal;
adjusting the SRS resources of the user by adopting the district estimated SRS resources;
distributing the adjusted user SRS resources to the user terminal;
the step of determining the estimated SRS resource of the cell comprises the steps of:
acquiring cell capacity, cell basic delay requirement and cell channel quality requirement;
calculating the theoretical symbol number of the SRS of the cell and the theoretical period of the SRS of the cell by adopting the cell capacity, the cell basic 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.
2. The method of claim 1, wherein the user SRS resources comprise a number of user first SRS symbols, a user first SRS period, and a user first SRS bandwidth.
3. The method of claim 2, wherein the step of adjusting user SRS resources using the cell predicted SRS resources comprises:
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 user required bandwidth by adopting the first SRS bandwidth of the user and the second SRS bandwidth of the user;
acquiring a second SRS symbol number of a user and a second SRS period of the user by adopting the moving speed of the user terminal;
determining the number of user demand symbols by adopting the number of the user second SRS symbols;
and determining a user demand period by adopting the user second SRS period.
4. The method of claim 3, wherein the step of determining a user desired bandwidth using the user first SRS bandwidth and the user second SRS bandwidth comprises:
determining a bandwidth maximum value in the first SRS bandwidth of the user and the second SRS bandwidth of the user;
and determining the maximum bandwidth value as the bandwidth required by the user.
5. The method of claim 4, further comprising, after the step of determining a user desired bandwidth using the user first SRS bandwidth and the user second SRS bandwidth:
Judging whether the user demand bandwidth is smaller than a preset user BWP bandwidth or not;
if yes, the bandwidth hopping mode is started.
6. The method of claim 4 or 5, wherein the step of determining the number of user desired symbols using the number of user second SRS symbols for the user terminal comprises:
determining the maximum value of the first SRS symbol number of the user and the second SRS symbol number of the user as a user undetermined symbol number;
and determining the minimum value of the number of the undetermined symbols of the user and the estimated number of the SRS of the cell as the number of the symbols required by the user.
7. The method of claim 6, wherein the step of determining the user demand period using the user second SRS period for the user terminal comprises:
determining a period minimum value of the district SRS estimated period, the user first SRS period and the user second SRS period;
and determining the minimum period as the user demand period.
8. The method according to any of claims 1-5, 7, wherein the step of determining target traffic delay requirements of user terminals within the cell comprises:
acquiring service delay requirements of at least one user terminal in the cell;
And determining the service delay requirement with the lowest delay as a target service delay requirement.
9. The method of claim 8, further comprising, prior to the step of adjusting the user SRS resources using the cell predicted SRS resources:
setting a triggering condition;
and when the triggering condition is met, executing the step of adopting the cell estimated SRS resource to adjust the user SRS resource.
10. A channel sounding reference signal, SRS, resource allocation apparatus, the apparatus comprising:
the district SRS resource estimating module is used for determining the estimated SRS resource of the district;
a service delay requirement determining module, configured to determine a target service delay requirement of a user terminal in the cell;
the initial user SRS resource determining module is used for determining user SRS resources by adopting the target service delay requirement of the user terminal;
a user SRS resource adjustment module, configured to adjust the user SRS resource by using the cell estimated SRS resource;
the user terminal module is used for distributing the adjusted user SRS resources to the user terminal;
the estimated SRS resource of the cell comprises the estimated symbol number of the SRS of the cell and the estimated period of the SRS of the cell, and the estimated SRS resource of the cell comprises:
The cell information acquisition sub-module is used for acquiring cell capacity, cell basic delay requirement and cell channel quality requirement;
the cell theory SRS resource calculation sub-module is used for calculating the number of the 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;
and the cell estimated SRS resource determining submodule is used for determining the number of the cell SRS estimated symbols and the cell SRS estimated period by adopting the number of the cell SRS theoretical symbols, the cell SRS theoretical period and a preset margin factor.
11. The apparatus of claim 10, wherein the user SRS resources comprise a number of user first SRS symbols, a user first SRS period, and a user first SRS bandwidth.
12. The apparatus of claim 11, wherein the user SRS resource adjustment module comprises:
a user terminal information acquisition sub-module for acquiring the moving speed of the user terminal and the quality requirement of a service channel;
a service channel quality requirement processing sub-module, configured to determine a second SRS bandwidth of a user using the service channel quality requirement of the user terminal;
a user required bandwidth determining sub-module, configured to determine a user required bandwidth by using the user first SRS bandwidth and the user second SRS bandwidth;
A mobile speed processing sub-module, configured to acquire a second SRS symbol number of a user and a second SRS period of the user by using the mobile 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 demand period determination submodule is used for determining the user demand period by adopting the user second SRS period.
13. The apparatus of claim 12, wherein the user-required bandwidth determination submodule comprises:
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 demand bandwidth determining unit is used for determining the maximum bandwidth value as the user demand bandwidth.
14. The apparatus of claim 13, wherein the user SRS resource adjustment module further comprises:
the frequency hopping judging sub-module is used for judging whether the bandwidth required by the user is smaller than a preset user BWP bandwidth or not;
and the frequency hopping execution sub-module is used for starting a bandwidth frequency hopping mode when the bandwidth required by the user is smaller than the preset BWP bandwidth of the user.
15. The apparatus according to claim 13 or 14, wherein the user requirement symbol number determination submodule comprises:
A user pending symbol number determining unit, configured to determine a maximum value of the user first SRS symbol number and the user second SRS symbol number as a user pending symbol number;
and the user demand symbol number determining unit is used for determining the minimum value of the number of the undetermined symbols of the user and the estimated number of the SRS of the cell as the user demand symbol number.
16. The apparatus of claim 15, wherein the user demand period determination submodule comprises:
a user minimum period determining unit, configured to determine a period minimum of the cell SRS estimation period, the user first SRS period, and the user second SRS period;
and the user demand period determining unit is used for determining the period minimum value as the user demand period.
17. The apparatus according to any of claims 10-14, 16, wherein the traffic delay requirement determination module comprises:
a service delay obtaining sub-module, configured to obtain a service delay requirement of at least one user terminal in the cell;
and the target service delay determining sub-module is used for determining the service delay requirement with the lowest delay as the target service delay requirement.
18. The apparatus of claim 17, wherein 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.
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