CN101784116B - Sounding reference signal resource allocation method, system and device - Google Patents
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Abstract
The invention discloses a sounding reference signal resource allocation method, a system and a device, which belong to the field of the mobile communication. The method comprises the following steps that: the present community area of the user terminal UE is obtained; the frequency band resource which is allocated in the community area according to the inter-cell interference coordination ICIC algorithm is of an SRS resource which is allocated to the UE. The system comprises a base station. The device comprises a base station device. According to the restriction of the UE usable frequency band and the physical layer real-time interference measurement result of the ICIC algorithm, the accuracy and the validity of the SRS resource allocation are improved, and reference is provided to the service coordination by transmitting the quality of SRS sounding sub-channel.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method, a system, and a device for sounding reference signal resource allocation.
Background
In a cell of an LTE (Long Term Evolution) system, a plurality of UEs (User equipments, User terminals) share time-frequency resources using a PUSCH (Physical Uplink Shared Channel), and a scheduler determines which UEs allocate which time-frequency resources in which time interval according to a scheduling principle, such as Channel quality of each current sub-Channel.
Wherein, for the estimation of each sub-channel quality, UE sends SRS (Sounding Reference Signal) according to the Sounding bandwidth and transmission power sent by the base station, and then the base station measures the channel quality according to the SRS. Since the SRS and the data are transmitted in the same subframe and occupy PUSCH resources, the SRS bandwidth configured for each UE must be considered to improve resource allocation efficiency and spectrum utilization as much as possible.
In an LTE cell, UE signals at the edge of the cell are weak, and require large transmission power, which causes large interference to neighboring cells. At present, the main strategy for reducing inter-cell Interference is ICIC (inter cell Interference Coordination), which restricts a time-frequency Resource PRB (Physical Resource Block) used by a cell edge UE to ensure that UEs belonging to a plurality of neighboring cells in neighboring areas of the neighboring cells do not occupy the same PRB as much as possible.
However, in the current SRS resource allocation method, if the available frequency band of the UE located at the edge of the cell is limited, the SRS bandwidth is allocated without considering this factor, so that the SRS resource exceeding the available bandwidth may be allocated to the UE, for example, the UE transmits the sounding reference signal over the full bandwidth each time, which causes unnecessary resource waste and leads to SRS resource shortage.
Disclosure of Invention
The embodiment of the invention provides a method, a system and equipment for allocating sounding reference signal resources, which improve the accuracy and effectiveness of SRS resource allocation.
In one aspect, an embodiment of the present invention provides a method for allocating sounding reference signal SRS resources, where the method includes:
acquiring a cell area where User Equipment (UE) is currently located;
allocating SRS resources to the UE according to frequency band resources allocated in the cell region by an inter-cell interference coordination ICIC algorithm;
the allocating, to the UE, the SRS resource according to the frequency band resource allocated in the cell region by the ICIC algorithm specifically includes:
allocating N Physical Resource Blocks (PRBs) for the UE in a frequency band resource range allocated by the cell region in an ICIC algorithm for transmitting an SRS; or,
acquiring a thermal noise value (IoT) of available PRBs, and allocating N PRBs with the minimum IoT value to the UE for sending the SRS;
and N is the number of PRBs determined by the cell-level bandwidth configuration information and the UE-level bandwidth configuration information.
In another aspect, an embodiment of the present invention provides a system for allocating SRS resources for sounding reference signals, where the system includes:
the base station is used for acquiring a cell area where the user equipment UE is currently located; allocating SRS resources to the UE according to frequency band resources allocated in the cell region by an inter-cell interference coordination ICIC algorithm;
the allocating, to the UE, the SRS resource according to the frequency band resource allocated in the cell region by the ICIC algorithm specifically includes:
allocating N Physical Resource Blocks (PRBs) for the UE in a frequency band resource range allocated by the cell region in an ICIC algorithm for transmitting an SRS; or,
acquiring a thermal noise value (IoT) of available PRBs, and allocating N PRBs with the minimum IoT value to the UE for sending the SRS;
and N is the number of PRBs determined by the cell-level bandwidth configuration information and the UE-level bandwidth configuration information.
In another aspect, an embodiment of the present invention provides a base station device, where the base station device includes:
the system comprises a position determining module, a position determining module and a position determining module, wherein the position determining module is used for determining a cell area where User Equipment (UE) is currently located;
an allocation module, configured to allocate SRS resources to the UE according to the frequency band resources allocated to the cell region obtained by the location determination module by the inter-cell interference coordination ICIC algorithm;
the allocating, to the UE, the SRS resource according to the frequency band resource allocated in the cell region by the ICIC algorithm specifically includes:
allocating N Physical Resource Blocks (PRBs) for the UE in a frequency band resource range allocated by the cell region in an ICIC algorithm for transmitting an SRS; or,
acquiring a thermal noise value (IoT) of available PRBs, and allocating N PRBs with the minimum IoT value to the UE for sending the SRS;
and N is the number of PRBs determined by the cell-level bandwidth configuration information and the UE-level bandwidth configuration information.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the method, the device and the system provided by the embodiment of the invention, the SRS resource is distributed to the UE according to the frequency band divided by the cell region where the UE is currently located by the ICIC algorithm, so that the accuracy and the efficiency of SRS resource distribution are improved.
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Fig. 1 is a flowchart illustrating a method for allocating SRS resources according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating another SRS resource allocation method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating another SRS resource allocation method according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating another SRS resource allocation method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
An embodiment of the present invention provides a method for allocating sounding reference signal SRS resources, and referring to fig. 1, the method includes:
101: acquiring a cell area where User Equipment (UE) is currently located;
102: and allocating SRS resources for the UE according to the frequency band resources allocated in the cell region by the inter-cell interference coordination ICIC algorithm.
The SRS resource allocation method provided by the embodiment of the invention allocates the SRS resource for the UE according to the frequency band divided by the cell region where the UE is currently located by the ICIC algorithm, and improves the accuracy and the efficiency of SRS resource allocation.
The embodiment of the present invention provides another method for SRS resource allocation, wherein a UE in the embodiment of the present invention is located in a cell to which an ICIC algorithm is applied, and referring to fig. 2, the specific implementation process is as follows:
201: and the base station receives an RSRP measurement report which is sent by the UE and relates to the ICIC algorithm, and learns that the UE is positioned at the edge of the current cell.
When the difference between the Reference Signal Receiving Power (Reference Signal Receiving Power) of the neighboring cell measured by the UE and the RSRP of the current cell is greater than a preset threshold, the UE reports the measurement report, where the measurement report includes the cell ID of the neighboring cell, the RSRP of the neighboring cell, and the RSRP of the current serving cell.
202: and the base station acquires the edge frequency band divided to the cell area of the current UE by the ICIC algorithm according to the cell ID of the adjacent cell in the measurement report message.
Wherein, the base station can search the edge frequency band divided to the region by the ICIC algorithm through the scheduler.
203: and the base station divides the edge frequency band of the area according to the ICIC algorithm to allocate SRS resources for the UE.
In this embodiment, when the base station performs SRS bandwidth configuration, it is first determined whether an available SRS resource exists in an edge frequency band corresponding to the UE, and if so, the SRS bandwidth is constrained in the edge frequency band corresponding to the UE, otherwise, the SRS resource cannot be allocated to the UE.
When the base station restricts the SRS bandwidth to the edge frequency band corresponding to the UE, the base station needs to simultaneously combine the frequency domain starting position of the SRS of the UE, or if the SRS is transmitted in a frequency hopping manner, the base station can further restrict the bandwidth for transmitting the SRS signal to the available edge frequency band of the UE as much as possible by combining the frequency hopping interval of the SRS.
A preferred embodiment of allocating SRS bandwidth resources to a UE by a base station is described in detail below:
as shown in table 1, in the system broadcast, the base station indicates the bandwidth configuration information of the cell level through 3 bits. The 3-bit information indicates which bandwidth of 0-7 is adopted, if the value is '001', the UE in the cell can select four configurations of a corresponding row corresponding to the 'SRS bandwidth configuration' column with the value of '1' in the upper table, in the PDCCH, the 2-bit information indicates the bandwidth configuration information of the UE level, and m in the table 1SRS，bI.e. the number of PRBs available for SRS determined for the cell-level bandwidth configuration information and the UE-level bandwidth configuration information.
The base station allocates an SRS bandwidth resource for the UE, and the PRB resource block which is determined by the cell-level bandwidth configuration information and the UE-level bandwidth configuration information and can be used for sending the SRS is determined by the cell-level bandwidth configuration information and the UE-level bandwidth configuration information, for example, assuming that the cell-level information is the same as the above, a value is "001", and a value of 2-bit information is "01", that is, b is 1, which indicates that the UE sends sounding reference signals on 16 PRBs each time, and which 16 PRBs are allocated is determined according to an edge band bandwidth corresponding to the UE.
TABLE 1
The base station also allocates the frequency domain starting position P and the time domain period T of the SRS to the UE, or if frequency hopping is adopted, the base station may also allocate the frequency hopping interval S of the SRS.
In this embodiment, if the PRB resource that can be allocated to the SRS in the system is larger than m in table 1SRS，bFor example, there are 35 PRB resource blocks, and at this time, the base station may consider IoT (Thermal noise) values on each PRB resource block when allocating SRS resources, that is, the base station finds out the PRB resource with the smallest IoT value in the edge band corresponding to the UE, and preferentially allocates these PRBs for sending SRS.
For example, find N consecutive PRBs with the smallest IoT value within the available edge band of the UE, and then allocate the N consecutive PRBs to the UE for transmitting the SRS, where N is m in Table 1SRS，bThe value is obtained. If the edge frequency band corresponding to the UE is not enough, then the SRS resource is allocated on the adjacent center frequency band.
In addition, for the UE in the cell that does not adopt the ICIC algorithm, the base station may directly find the N consecutive PRBs with the minimum IoT value in the available frequency band of the current UE according to the IoT interference situation on each PRB reported by the physical layer, and then allocate the N consecutive PRBs to the UE as the frequency band for sending the SRS, where N is one of the number and types specified by the protocol, thereby realizing allocation of the SRS bandwidth on the PRB resources with smaller interference, so as to improve accuracy and efficiency of SRS resource allocation.
According to the method provided by the embodiment of the invention, the SRS resource is distributed to the UE according to the constraint of the ICIC algorithm on the usable frequency band of the UE and the real-time interference measurement result of the physical layer, and the SRS bandwidth is preferentially constrained on the cell edge frequency band specified by the ICIC algorithm and the PRB resource with smaller interference, so that the accuracy and the efficiency of SRS resource distribution are improved.
The embodiment of the present invention provides another method for SRS resource allocation, wherein a UE in the embodiment of the present invention is located in a cell to which an ICIC algorithm is applied, and referring to fig. 3, the specific implementation process is as follows:
301: and the base station receives the scheduling request reported by the UE and acquires the cell area where the UE is currently located.
In this embodiment, the UE does not report RSRP and knows that the UE is located in the center of the current cell.
302: and the base station searches the frequency band divided by the ICIC algorithm for the central area.
The base station may search a frequency band divided for the center region by the ICIC algorithm through the scheduler.
303: and the base station divides the central frequency band of the region according to the ICIC algorithm to allocate SRS resources for the UE.
In this embodiment, the specific method for allocating the SRS resource to the UE by the base station is the same as step 203, which is not described herein again.
According to the method provided by the embodiment of the invention, the SRS resource is allocated to the UE according to the constraint of the ICIC algorithm on the usable frequency band of the UE located in the central area of the cell and the real-time interference measurement result of the physical layer, and the SRS bandwidth is preferentially constrained on the central frequency band specified by the ICIC algorithm and the PRB resource with less interference, so that the accuracy and the efficiency of SRS resource allocation are improved.
The embodiment of the invention provides a method for SRS resource allocation, wherein UE in the embodiment of the invention is positioned in a cell applying an ICIC algorithm, and the specific contents are as follows:
firstly, Power Headroom (PHR) reported by the UE periodically and Power of SRS transmitted by the UE are introduced:
PHR＝PMAX-{10log10(MPUSCH(i))+PO_PUSCH(j)+α·PL+ΔTF(TF(i))+f(i)}
in the formula, PMAXRepresents the maximum transmit power of the UE, limited by the capability of the UE; mPUSCH(i) Representing the number of RBs allocated to the UE by the current TTI; pO_PUSCH(j) Representing the uplink power expected to be received by the cell; α is a filter factor; PL is the path loss from the transmit antenna to the UE; deltaTF(tf (i)) represents a power offset value; f (i) represents an accumulated power control command. As can be seen in the formula, PHR is the difference between the maximum transmit power of the UE and the actual transmit power.
The power of the UE transmitting the SRS is:
PSRS(i)＝min{PMAX，PSRS_OFFSET+10log10(MSRS)+PO_PUSCH(j)+α·PL+f(i)}
in the formula, PSRS(i) Indicating the power of the UE for sending the SRS in the ith subframe; mSRSThe bandwidth of each SRS transmission is shown as "16 PRBs" in table 1. As shown in the formula, the bandwidth M of each SRS transmissionSRSThe larger the transmit power that needs to be provided by the UE.
If the PHR value is smaller, in order to meet the requirement that the transmitted PHR of the UE is a certain positive value, the power of SRS transmitted by the UE must be reduced, so that the bandwidth allocated to the UE for transmitting the SRS each time must be reduced; if the PHR is increased, it indicates that the power of SRS transmission by the UE is small, and if the SRS resource is abundant, it may be considered to increase the bandwidth of SRS transmission each time to support sounding over a larger bandwidth; if the SRS resource is limited, the bandwidth for transmitting the SRS each time does not need to be changed.
The method provided by the embodiment of the present invention is described below by taking an example of terminal triggered SRS reconfiguration, and referring to fig. 4, the specific implementation process is as follows:
401: the base station receives the PHR reported by the UE, and if the PHR reaches a preset threshold, the SRS bandwidth is reconfigured;
when the PHR reported by the UE periodically becomes smaller and reaches a preset threshold, the base station reconfigures the SRS bandwidth for the UE, and in order to meet the requirement that the PHR is a certain positive value, the transmission power of the UE needs to be reduced, and the SRS bandwidth needs to be reduced. The PHR reaching the preset threshold is preset according to actual needs, and a lowest threshold is set when the PHR is reduced.
402: and the base station reallocates the SRS resource for the UE.
For the base station to reallocate the SRS resource for the UE, refer to the steps of embodiment 2 and embodiment 3.
For the case that the PHR periodically reported by the UE becomes larger, when the PHR periodically reported by the UE reaches a preset threshold, for example, the current distance between the UE and the receiving antenna is closer, the path loss is reduced, resulting in an increase in the power margin. At this time, the constraint on the SRS bandwidth is reduced, the original configuration can be maintained, and the UE can also be supported to transmit the SRS over a larger bandwidth, depending on the resource occupancy rate on the current available frequency band of the UE and whether the UE is at the cell edge, which is specifically as follows:
(1) and if the UE moves from the edge position to the cell center position, triggering SRS reconfiguration when the PHR value exceeds a threshold value.
The case where the PHR value exceeds the threshold may be: case one, when the UE moves from the cell edge to the center position; or, in case two, the UE moves from the cell edge position to the center position, but is still at the edge position; alternatively, in case three, the UE moves from the cell center area to a more central area position.
When the SRS is reconfigured, the base station judges that the UE returns to the center of a cell currently according to the latest RSRP measurement report of the UE about the ICIC algorithm, and obtains currently available central frequency band resources.
In case two and case three, according to the requirement of the ICIC algorithm, the UE is not triggered to report the RSRP measurement report related to the ICIC algorithm, so that the available frequency band of the UE is not changed during SRS reconfiguration, but the limit on the SRS bandwidth is reduced. If the available frequency band has more idle resources, a larger bandwidth can be reallocated to the UE to support higher channel estimation accuracy; if there are fewer idle resources, no changes are made.
According to the method provided by the embodiment of the invention, when the PHR change reported periodically by the UE reaches the preset threshold, the base station triggers the reconfiguration of the SRS bandwidth, and the SRS resource is allocated to the UE according to the constraint of the ICIC algorithm on the usable frequency band of the UE and the real-time interference measurement result of the physical layer, so that the accuracy and the efficiency of SRS resource allocation are improved.
In order to restrict SRS resource allocation of a UE to improve accuracy and efficiency of SRS resource allocation, an embodiment of the present invention provides a system for SRS resource allocation of sounding reference signals, where the system includes:
the base station is used for acquiring a cell area where the user equipment UE is currently located; and allocating SRS resources for the UE according to the frequency band resources allocated in the cell region by the inter-cell interference coordination ICIC algorithm.
According to the system provided by the embodiment of the invention, the SRS resource is distributed to the UE through the constraint of the ICIC algorithm on the usable frequency band of the UE and the real-time interference measurement result of the physical layer, and the SRS bandwidth is preferentially constrained on the usable frequency band specified by the current ICIC algorithm, so that the accuracy and the high efficiency of SRS resource distribution are improved, and the purpose of providing reference for scheduling service through sending SRS sounding sub-channel quality is realized.
In order to constrain SRS resource allocation of a UE to improve accuracy and efficiency of SRS resource allocation, an embodiment of the present invention provides a base station apparatus, and referring to fig. 5, the apparatus includes:
a location determining module 501, configured to determine a cell area where a UE is currently located;
an allocating module 502, configured to allocate SRS resources to the UE according to the frequency band resources allocated to the cell region obtained by the location determining module 501 by the inter-cell interference coordination ICIC algorithm.
The location determining module 501 is further configured to determine that the UE is located in a cell edge area if a measurement report meeting a first condition reported by the UE is received, where the first condition is that a difference between reference signal received power RSRP of an adjacent cell and RSRP of a current cell is greater than a preset threshold;
the location determining module 501 is further configured to determine that the UE is in a cell center area if RSRP of the UE related to the ICIC algorithm is not received.
Wherein the module 502 is further allocated
The method comprises the steps of allocating PRBs determined by cell-level bandwidth configuration information and UE-level bandwidth configuration information to the UE for sending the SRS in the frequency band resource range allocated by the ICIC algorithm in a cell region;
the allocating module 502 is further configured to obtain a thermal noise value IoT of an available PRB, allocate N consecutive PRBs with the minimum IoT value to the UE for sending the SRS, where N is the number of PRBs determined by the cell-level bandwidth configuration information and the UE-level bandwidth configuration information.
According to the base station equipment provided by the embodiment of the invention, the SRS resource is allocated to the UE according to the restriction of the ICIC algorithm on the available frequency band of the UE and the real-time interference measurement result of the physical layer, and the SRS bandwidth is preferentially restricted on the available frequency band specified by the ICIC algorithm and the PRB resource with smaller interference, so that the accuracy and the efficiency of SRS resource allocation are improved, and the purpose of providing reference for scheduling service by sending SRS sounding sub-channel quality is realized.
The embodiments of the present invention may be implemented by software, and the corresponding software program may be stored in a readable storage medium, for example, a hard disk, a cache, or an optical disk of a router.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A method for Sounding Reference Signal (SRS) resource allocation, the method comprising:
acquiring a cell area where User Equipment (UE) is currently located;
allocating SRS resources to the UE according to frequency band resources allocated in the cell region by an inter-cell interference coordination ICIC algorithm;
the allocating, to the UE, the SRS resource according to the frequency band resource allocated in the cell region by the ICIC algorithm specifically includes:
allocating N Physical Resource Blocks (PRBs) for the UE in a frequency band resource range allocated by the cell region in an ICIC algorithm for transmitting an SRS; or,
acquiring a thermal noise value (IoT) of available PRBs, and allocating N PRBs with the minimum IoT value to the UE for sending the SRS;
and N is the number of PRBs determined by the cell-level bandwidth configuration information and the UE-level bandwidth configuration information.
2. The method according to claim 1, wherein said obtaining the cell area in which the UE is currently located specifically comprises:
if an RSRP measurement report which meets a condition one and is about to ICIC algorithm and reported by the UE is received, determining that the UE is in a cell edge area, wherein the condition one is that the difference value of Reference Signal Received Power (RSRP) of an adjacent cell and the RSRP of a current cell is larger than a preset threshold value; or,
determining that the UE is in a cell center region if no RSRP measurement report of the UE about ICIC algorithm is received.
3. A system for sounding reference signal, SRS, resource allocation, the system comprising:
the base station is used for acquiring a cell area where the user equipment UE is currently located; allocating SRS resources to the UE according to frequency band resources allocated in the cell region by an inter-cell interference coordination ICIC algorithm;
the allocating, to the UE, the SRS resource according to the frequency band resource allocated in the cell region by the ICIC algorithm specifically includes:
allocating N Physical Resource Blocks (PRBs) for the UE in a frequency band resource range allocated by the cell region in an ICIC algorithm for transmitting an SRS; or,
acquiring a thermal noise value (IoT) of available PRBs, and allocating N PRBs with the minimum IoT value to the UE for sending the SRS;
and N is the number of PRBs determined by the cell-level bandwidth configuration information and the UE-level bandwidth configuration information.
4. A base station apparatus, characterized in that the apparatus comprises:
the system comprises a position determining module, a position determining module and a position determining module, wherein the position determining module is used for determining a cell area where User Equipment (UE) is currently located;
an allocation module, configured to allocate SRS resources to the UE according to the frequency band resources allocated to the cell region obtained by the location determination module by the inter-cell interference coordination ICIC algorithm;
the allocating, to the UE, the SRS resource according to the frequency band resource allocated in the cell region by the ICIC algorithm specifically includes:
allocating N Physical Resource Blocks (PRBs) for the UE in a frequency band resource range allocated by the cell region in an ICIC algorithm for transmitting an SRS; or,
acquiring a thermal noise value (IoT) of available PRBs, and allocating N PRBs with the minimum IoT value to the UE for sending the SRS;
and N is the number of PRBs determined by the cell-level bandwidth configuration information and the UE-level bandwidth configuration information.
5. The apparatus of claim 4,
the location determining module is further configured to determine that the UE is located in a cell edge area if a measurement report meeting a first condition reported by the UE is received, where the first condition is that a difference between reference signal received power RSRP of an adjacent cell and RSRP of a current cell is greater than a preset threshold;
the location determining module is further configured to determine that the UE is in a cell center region if an RSRP measurement report of the UE about an ICIC algorithm is not received.
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