CN107295658B - Resource allocation method, source base station and target base station in switching process - Google Patents

Resource allocation method, source base station and target base station in switching process Download PDF

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Publication number
CN107295658B
CN107295658B CN201610203605.XA CN201610203605A CN107295658B CN 107295658 B CN107295658 B CN 107295658B CN 201610203605 A CN201610203605 A CN 201610203605A CN 107295658 B CN107295658 B CN 107295658B
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terminal
switched
base station
buffer area
area state
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CN107295658A (en
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赵亚利
许芳丽
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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Priority to PCT/CN2017/076258 priority patent/WO2017166989A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a resource allocation method, a source base station and a target base station in a switching process. The invention sends the uplink/downlink buffer area state information of the terminal to the target base station by the source base station in the switching process, so that the target base station can more reasonably distribute resources in the switching process.

Description

Resource allocation method, source base station and target base station in switching process
Technical Field
The invention relates to the technical field of wireless communication switching, in particular to a resource allocation method, a source base station and a target base station in a switching process.
Background
In a switching process based on an X2 interface in a Long Term Evolution system (LTE), a source base station (eNB) judges to execute X2 switching operation according to a measurement result, and the source eNB sends a switching request message to a target eNB, wherein the switching request message comprises an access layer key KeNB which needs to be changed after switching, all parameters related to bearing of a terminal (UE) and the like; then, the target eNB configures a new Bearer including a PDCP/RLC/MAC entity of a Signaling Radio Bearer (SRB) and a Data Radio Bearer (DRB) according to the parameters. The target eNB performs admission judgment, and if the decision is that admission is possible, the target eNB returns a handover response message to the source eNB. And the source eNB receives the switching response message and then sends an RRC reconfiguration message to the UE, and meanwhile, the source eNB stops receiving and sending data and a control plane. And after receiving the RRC reconfiguration message, the UE starts to stop receiving and transmitting data and control planes at the source eNB and performs synchronous operation with the target eNB.
The synchronization operation includes downlink synchronization and uplink synchronization. The method comprises the following specific steps: the UE first completes downlink synchronization with the target base station through a Physical layer process, and then initiates a Random Access Channel (RACH) process (specifically, non-contention Random Access or contention Random Access) to the target base station according to a downlink timing relationship of the target base station and a preamble (preamble) and PRACH (Physical Random Access Channel) indication carried in the RRC reconfiguration signaling. The purpose of RACH is to establish uplink synchronization with a target base station.
A scheme is needed to be provided, so that uplink resources (uplink scheduling grant) of a target cell can be reasonably allocated to a UE in a UE handover process, so as to reasonably utilize the resources of the target cell and reduce uplink overhead caused by a subsequent unnecessary scheduling request/buffer status report (SR/BSR) process.
Disclosure of Invention
The technical problem to be solved in the embodiments of the present invention is to provide a resource allocation method, a source base station, and a target base station in a handover process, so that the target base station can allocate resources more reasonably in the handover process.
To solve the foregoing technical problem, a method for allocating resources in a handover process provided in an embodiment of the present invention includes:
the method comprises the steps that a source base station determines the current buffer area state of a terminal to be switched, wherein the buffer area state comprises at least one of an uplink buffer area state and a downlink buffer area state;
the source base station sends buffer area state indication information used for indicating the current buffer area state of the terminal to be switched to a target base station according to the current buffer area state of the terminal to be switched;
the source base station receives resource allocation information returned by the target base station after allocating resources for the terminal to be switched according to the buffer area state indication information;
and the source base station sends the resource allocation information to the terminal to be switched.
Preferably, in the above-mentioned resource allocation method,
the source base station further carries the buffer area state indication information in a switching request and sends the switching request to the target base station;
the source base station further receives the resource allocation information from a handover response message sent by the target base station; and the number of the first and second groups,
and the source base station further carries the resource allocation information in an RRC connection reconfiguration message and sends the RRC connection reconfiguration message to the terminal to be switched.
Preferably, in the above-mentioned resource allocation method,
when the buffer area state comprises an uplink buffer area state, the step of determining the current buffer area state of the terminal to be switched comprises the following steps:
determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request and the uplink scheduling condition of the terminal to be switched after the last uplink scheduling request is reported;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report and the uplink scheduling condition of the terminal to be switched after the last measurement report is reported.
Preferably, in the above-mentioned resource allocation method,
when the buffer status includes an uplink buffer status, the step of sending, to a target base station, buffer status indication information for indicating the current buffer status of the terminal to be switched according to the current buffer status of the terminal to be switched includes:
determining the uplink buffer area state of each logic channel group LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, calculating a first sum of the uplink buffer area states of each LGG, and sending first buffer area state indication information carrying the first sum to the target base station;
or, determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, and sending second buffer area state indication information carrying the uplink buffer area state of part or all LCGs to the target base station.
Preferably, in the above-mentioned resource allocation method,
and when the second buffer status indication information is sent to the target base station, further carrying the QoS parameters corresponding to part or all of the LCGs in the second buffer status indication information.
Preferably, in the above-mentioned resource allocation method,
when the buffer area state comprises a downlink buffer area state, the step of determining the current buffer area state of the terminal to be switched comprises the following steps:
taking the buffer area state of each current downlink RB of the terminal to be switched as the current downlink buffer area state of the terminal to be switched;
or, according to the QoS parameters of each RB, grouping the current downlink RBs of the terminal to be switched, and determining the downlink buffer area state corresponding to each downlink RB group as the current downlink buffer area state of the terminal to be switched.
Preferably, in the above-mentioned resource allocation method,
when the buffer area state comprises a downlink buffer area state, the step of sending buffer area state indication information for indicating the current buffer area state of the terminal to be switched to a target base station according to the current buffer area state of the terminal to be switched comprises the following steps:
when the current downlink buffer area state of the terminal to be switched is the buffer area state of each current downlink RB of the terminal to be switched: calculating a second sum of the buffer status of each current downlink RB of the terminal to be switched, and sending third buffer status indication information carrying the second sum to the target base station; or, according to the buffer status of each current downlink RB of the terminal to be switched, sending fourth buffer status indication information carrying the downlink buffer status of part or all downlink RBs to the target base station;
when the current downlink buffer area state of the terminal to be switched is the buffer area state corresponding to each downlink RB group of the terminal to be switched: calculating a third sum of the buffer status corresponding to each downlink RB group of the terminal to be switched, and sending fifth buffer status indication information carrying the third sum to the target base station; or, according to the buffer area state corresponding to each current downlink RB group of the terminal to be switched, sending sixth buffer area state indication information carrying downlink buffer area states corresponding to part or all downlink RB groups to the target base station.
Preferably, in the above-mentioned resource allocation method,
when the fourth buffer status indication information is sent to the target base station, the QoS parameters corresponding to the part or all of the downlink RBs are further carried in the fourth buffer status indication information;
and when the sixth buffer status indication information is sent to the target base station, further carrying the QoS parameters corresponding to the part or all of the downlink RB groups in the sixth buffer status indication information.
The embodiment of the invention also provides another resource allocation method in the switching process, which comprises the following steps:
the method comprises the steps that a target base station receives buffer area state indication information which is sent by a source base station and used for indicating the current buffer area state of a terminal to be switched, wherein the buffer area state comprises at least one of an uplink buffer area state and a downlink buffer area state;
and the target base station allocates corresponding resources for the terminal to be switched according to the buffer area state indication information, and sends resource allocation information for indicating the resources to the source base station.
Preferably, in the above-mentioned resource allocation method,
the target base station further receives the buffer status indication information from the handover request sent by the source base station, and,
and the target base station further carries the resource allocation information in a switching response message and sends the switching response message to the source base station.
The embodiment of the present invention further provides a source base station, including:
a buffer status determining unit, configured to determine a current buffer status of a terminal to be switched, where the current buffer status includes at least one of an uplink buffer status and a downlink buffer status;
a first sending unit, configured to send, to a target base station, buffer status indication information for indicating a current buffer status of the terminal to be switched according to the current buffer status of the terminal to be switched;
a receiving unit, configured to receive resource allocation information returned by the target base station after allocating resources to the terminal to be switched according to the buffer status indication information;
and the second sending unit is used for sending the resource allocation information to the terminal to be switched.
Preferably, in the source base station described above,
the first sending unit is further configured to send the buffer status indication information to the target base station by carrying the buffer status indication information in a handover request;
the receiving unit is further configured to receive the resource allocation information from a handover response message sent by the target base station; and the number of the first and second groups,
and the second sending unit is further used for carrying the resource allocation information in an RRC connection reconfiguration message and sending the RRC connection reconfiguration message to the terminal to be switched.
Preferably, in the source base station, the buffer status determining unit includes:
an upstream buffer status determination unit, configured to, when the buffer status comprises an upstream buffer status:
determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request and the uplink scheduling condition of the terminal to be switched after the last uplink scheduling request is reported;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report and the uplink scheduling condition of the terminal to be switched after the last measurement report is reported.
Preferably, in the source base station, the first transmitting unit includes:
an upstream buffer status sending unit, configured to, when the buffer status includes an upstream buffer status:
determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, calculating a first sum of the uplink buffer area states of each LGG, and sending first buffer area state indication information carrying the first sum to the target base station;
or, determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, and sending second buffer area state indication information carrying the uplink buffer area state of part or all LCGs to the target base station.
Preferably, in the source base station described above,
the uplink buffer status sending unit, when sending the second buffer status indication information to the target base station, further carries the QoS parameters corresponding to part or all of the LCGs in the second buffer status indication information.
Preferably, in the source base station, the buffer status determining unit includes:
a downstream buffer status determination unit, configured to, when the buffer status includes a downstream buffer status:
taking the buffer area state of each current downlink RB of the terminal to be switched as the current downlink buffer area state of the terminal to be switched;
or, according to the QoS parameters of each RB, grouping the current downlink RBs of the terminal to be switched, and determining the downlink buffer area state corresponding to each downlink RB group as the current downlink buffer area state of the terminal to be switched.
Preferably, in the source base station, the first transmitting unit includes:
a downlink buffer area status sending unit, configured to, when the current downlink buffer area status of the terminal to be switched is a buffer area status of each current downlink RB of the terminal to be switched: calculating a second sum of the buffer status of each current downlink RB of the terminal to be switched, and sending third buffer status indication information carrying the second sum to the target base station; or, according to the buffer status of each current downlink RB of the terminal to be switched, sending fourth buffer status indication information carrying the downlink buffer status of part or all downlink RBs to the target base station; and when the current downlink buffer area state of the terminal to be switched is the buffer area state corresponding to each downlink RB group of the terminal to be switched: calculating a third sum of the buffer status corresponding to each downlink RB group of the terminal to be switched, and sending fifth buffer status indication information carrying the third sum to the target base station; or, according to the buffer area state corresponding to each current downlink RB group of the terminal to be switched, sending sixth buffer area state indication information carrying downlink buffer area states corresponding to part or all downlink RB groups to the target base station.
Preferably, in the source base station, when the downlink status transmitting unit transmits the fourth buffer status indication information to the target base station, the downlink status transmitting unit further carries QoS parameters corresponding to the part or all of the downlink RBs in the fourth buffer status indication information; and when the sixth buffer status indication information is sent to the target base station, further carrying the QoS parameters corresponding to the part or all of the downlink RB groups in the sixth buffer status indication information.
An embodiment of the present invention further provides a target base station, including:
a receiving unit, configured to receive buffer status indication information sent by a source base station and used for indicating a current buffer status of a terminal to be switched, where the buffer status includes at least one of an uplink buffer status and a downlink buffer status;
the allocation unit is used for allocating corresponding resources to the terminal to be switched according to the buffer area state indication information;
a sending unit, configured to send resource allocation information indicating the resource to the source base station.
Preferably, in the target base station, the receiving unit is further configured to receive the buffer status indication information from a handover request sent by the source base station, and,
the sending unit is further configured to send the resource allocation information to the source base station by carrying the resource allocation information in a handover response message.
Compared with the prior art, the resource allocation method, the source base station and the target base station in the switching process provided by the embodiment of the invention have the advantages that the source base station sends the relevant information of the uplink/downlink buffer area state of the terminal to the target base station in the switching process, so that the target base station can allocate uplink and/or downlink resources to the terminal, the target base station is prevented from allocating resources blindly, and the rationality of resource allocation is improved.
Drawings
Fig. 1 is a schematic diagram of a resource allocation method in a handover process according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a resource allocation method in another handover process according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating resource allocation in a wireless communication system according to an embodiment of the present invention;
FIG. 4 is a flow chart illustrating resource allocation in a wireless communication system according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating resource allocation in a wireless communication system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a source base station according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another source base station according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a target base station according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another target base station according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
In addition, the terms "system" and "network" are often used interchangeably herein.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
In the embodiment of the invention, the source base station is the base station to which the current service cell of the terminal belongs, and the target base station is the base station to which the target cell switched by the terminal belongs. In the embodiment of the present invention, the form of the Base Station is not limited, and may be a macro Base Station (macro Base Station), a micro Base Station (Pico Base Station), a Node B (the name of a 3G mobile Base Station), an enhanced Base Station (ENB), a Home enhanced Base Station (Femto ENB or Home eNode B or Home ENB or HNEB), a relay Station, an access point, and the like. The terminal may be a mobile telephone (or handset), or other device capable of transmitting or receiving wireless signals, including a User Equipment (UE), a Personal Digital Assistant (PDA), a wireless modem, a wireless communicator, a handset, a laptop computer, a cordless telephone, a Wireless Local Loop (WLL) station, or a mobile intelligent hotspot, intelligent appliance, or other device capable of autonomously communicating with a mobile communications network without human operation, etc.
With the rapid development of wireless communication technology, the user's demand for service experience is continuously increasing. The two most critical metrics for the service experience are data rate and latency. Since delay is always an important performance index concerned by operators or end users, delay reduction is always a hot technical direction in the industry. On the other hand, according to statistics, the service interruption time of the X2 handover procedure is generally about 50ms, and may be as high as 80ms or more. Service interruption delays during handover can affect user experience.
Therefore, the 3GPP has made LR legislation, and one direction is to reduce the delay in the handover process. One particular latency reduction scheme referred to in this clause is RACH-less handover. When the source cell and the target cell are synchronized, the UE may use RACH-less handover, specifically, there are two schemes to implement RACH-less handover:
scheme 1 one method is that the UE is directly switched from a source cell to a target cell in a proper System Frame Number (SFN) (agreed by both parties) without executing a random access process;
scheme 2: another method is that the UE performs a conventional handover procedure but skips the random access procedure and switches to the target cell.
According to the time delay composition analysis, the total time delay of the handover process is usually 40-50 ms, and the time delay of the RACH process is usually 10-12 ms. Therefore, skipping the RACH procedure can significantly reduce the service interruption time during handover.
The purpose of the RACH in the handover process includes acquiring a Timing Advance (TA) of the target cell and acquiring, by the UE, an uplink scheduling grant for completing signaling transmission for handover. Therefore, the RACH-less handover procedure has two problems to be solved, including 1) how to obtain the TA of the target cell and 2) how to obtain the uplink resource allocation (uplink scheduling grant) of the target cell. In view of the above problem 2), it is desirable to provide a resource allocation scheme, so that the target base station can reasonably allocate resources in the RACH-less handover process.
The RACH-less handover procedure does not have the RACH procedure, and thus, the uplink resource allocation (uplink scheduling grant) and/or the downlink resource allocation of the target cell need to be obtained by other methods. If the target base station only performs blind allocation of uplink/downlink resources, the blind allocation easily causes unreasonable resource allocation. For example, if the resource allocation is too large, it will cause resource waste; if the resource allocation is too small, a subsequent scheduling request/buffer status report (SR/BSR) procedure is also required, which may cause unnecessary uplink overhead.
The embodiment of the invention provides a resource allocation method in the switching process aiming at the switching process (including but not limited to RACH-less switching) in the prior art, so that a target base station can allocate uplink and/or downlink resources to a terminal more reasonably. Hereinafter, the handover may be an X2 handover based on an X2 port, or may be a RACH-less handover. Particularly, when the embodiment of the invention is applied to RACH-less switching, blind resource allocation caused by lack of an RACH process of a target base station can be avoided, and the rationality of resource allocation is improved.
An embodiment of the present invention provides a resource allocation method in a handover process, please refer to fig. 1, where the resource allocation method includes the following steps:
step 11, the source base station determines the current buffer area state of the terminal to be switched, wherein the buffer area state comprises at least one of an uplink buffer area state and a downlink buffer area state.
And step 12, the source base station sends buffer area state indication information for indicating the current buffer area state of the terminal to be switched to the target base station according to the current buffer area state of the terminal to be switched.
Here, the source base station may carry the buffer status indication information in a handover request and send the handover request to the target base station.
And step 13, the source base station receives resource allocation information returned by the target base station after allocating resources for the terminal to be switched according to the buffer area state indication information.
Here, the source base station may receive the resource allocation information from a handover response message transmitted by the target base station.
And step 14, the source base station sends the resource allocation information to the terminal to be switched.
Here, the source base station may carry the resource allocation information in an RRC connection reconfiguration message and send the RRC connection reconfiguration message to the terminal to be switched, so that after the terminal to be switched is switched to a target cell corresponding to the target base station, data transmission may be performed according to uplink and/or downlink resources.
Through the steps, the embodiment of the invention can send the relevant information of the uplink and/or downlink buffer area state of the terminal to the target base station in the switching process of the source base station, so that the target base station can allocate uplink and/or downlink resources to the terminal, the target base station is prevented from blindly allocating resources, and the rationality of resource allocation is improved.
In this embodiment of the present invention, when the buffer status only includes an uplink buffer status, in step 11, the determining of the current buffer status of the terminal to be switched may be implemented as follows:
determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request and the uplink scheduling condition of the terminal to be switched after the last uplink scheduling request is reported;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report and the uplink scheduling condition of the terminal to be switched after the last measurement report is reported.
Correspondingly, in step 12, if the buffer status indication information for indicating the current buffer status of the terminal to be switched is sent to the target base station according to the current buffer status of the terminal to be switched, the following method may be implemented:
determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, calculating a first sum of the uplink buffer area states of each LGG, and sending first buffer area state indication information carrying the first sum to the target base station;
or, determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, and sending second buffer area state indication information carrying the uplink buffer area state of part or all LCGs to the target base station. Here, when the second buffer status indication information is sent to the target base station, the QoS parameters corresponding to part or all of the LCGs may be further carried in the second buffer status indication information.
In this embodiment of the present invention, when the buffer status only includes a downlink buffer status, in step 11, the determining of the current buffer status of the terminal to be switched may be implemented as follows:
taking the buffer area state of each current downlink Radio Bearer (RB) of the terminal to be switched as the current downlink buffer area state of the terminal to be switched;
or, according to the QoS parameters of each RB, grouping the current downlink RBs of the terminal to be switched, and determining the downlink buffer area state corresponding to each downlink RB group as the current downlink buffer area state of the terminal to be switched.
Correspondingly, in step 12, if the buffer status indication information for indicating the current buffer status of the terminal to be switched is sent to the target base station according to the current buffer status of the terminal to be switched, the following method may be implemented:
when the current downlink buffer area state of the terminal to be switched is the buffer area state of each current downlink RB of the terminal to be switched: calculating a second sum of the buffer status of each current downlink RB of the terminal to be switched, and sending third buffer status indication information carrying the second sum to the target base station; or, according to the buffer status of each current downlink RB of the terminal to be switched, sending fourth buffer status indication information carrying the downlink buffer status of part or all downlink RBs to the target base station;
when the current downlink buffer area state of the terminal to be switched is the buffer area state corresponding to each downlink RB group of the terminal to be switched: calculating a third sum of the buffer status corresponding to each downlink RB group of the terminal to be switched, and sending fifth buffer status indication information carrying the third sum to the target base station; or, according to the buffer area state corresponding to each current downlink RB group of the terminal to be switched, sending sixth buffer area state indication information carrying downlink buffer area states corresponding to part or all downlink RB groups to the target base station.
Here, when the source base station sends the fourth buffer status indication information to the target base station, the source base station may further carry the QoS parameters corresponding to part or all of the downlink RBs in the fourth buffer status indication information. Or, when the source base station sends the sixth buffer status indication information to the target base station, the sixth buffer status indication information may further carry QoS parameters corresponding to part or all of the downlink RB groups.
The above description is made for the two cases of the uplink buffer status and the downlink buffer status. In this embodiment of the present invention, the buffer status determined in step 11 may include an uplink buffer status and a downlink buffer status at the same time. At this time, referring to the specific implementation of the two cases, in step 11, the current uplink buffer state and downlink buffer state of the terminal to be switched are determined; in step 12, buffer status indication information for indicating the current uplink buffer status and downlink buffer status of the terminal to be switched is sent to the target base station, so that the target base station allocates uplink resources and downlink resources to the terminal to be switched according to the buffer status indication information, receives resource allocation information sent by the target base station in step 13, and sends related information of the allocated resources to the terminal to be switched in step 14.
An embodiment of the present invention provides another resource allocation method in a handover process, referring to fig. 2, the resource allocation method includes the following steps:
step 21, the target base station receives buffer area state indication information which is sent by the source base station and used for indicating the current buffer area state of the terminal to be switched, wherein the buffer area state comprises at least one of an uplink buffer area state and a downlink buffer area state.
Here, the target base station may receive the buffer status indication information from the handover request transmitted by the source base station.
And step 22, the target base station allocates corresponding resources to the terminal to be switched according to the buffer area state indication information.
Step 23, sending resource allocation information for indicating the resource to the source base station.
Here, the target base station may carry the resource allocation information in a handover response message and send the handover response message to the source base station.
In step 22, the target base station allocates corresponding resources to the terminal to be switched according to the current buffer status of the terminal to be switched indicated by the buffer status indication information. For a specific resource allocation manner, various implementations in the prior art may be referred to, and the embodiment of the present invention does not limit this.
Through the steps, in the switching process of the target base station in the embodiment of the invention, the uplink and/or downlink resources can be allocated to the terminal according to the relevant information of the current uplink and/or downlink buffer area state of the terminal, which is sent by the source base station, so that the targeted resource allocation can be realized, the blind allocation behavior is avoided, and the rationality of the resource allocation is improved.
The present invention will be further described in conjunction with a message flow diagram for a wireless communication system.
Referring to fig. 3, a method for allocating uplink resources in a handover process according to an embodiment of the present invention is applied to a wireless communication system including a terminal, a source base station, and a target base station, and the method for allocating uplink resources includes the following steps:
step 31, the terminal reports the measurement report to the source base station.
Here, the terminal may perform measurement on the current serving cell and the neighbor cell periodically or based on a predetermined event trigger. When the reporting condition of the measurement report is met, the terminal sends the measurement report to the source base station, and the measurement report usually includes measurement results of the serving cell and the neighboring cell.
In the embodiment of the present invention, the terminal may carry the current uplink buffer status information of the terminal in the measurement report, and certainly, the terminal may also report the current uplink buffer status information to the source base station in the uplink scheduling request. In the embodiment of the present invention, the uplink buffer status information may be the uplink buffer status (e.g., the size of the buffer) of each Logical Channel Group (LCG) of the terminal to be switched.
And step 32, the source base station performs handover decision according to the measurement report of the terminal in step 31, and determines a target cell to be handed over and a target base station to which the target cell belongs when cell handover needs to be executed.
Here, the implementation manner of the handover decision may be implemented by referring to the prior art, and the embodiment of the present invention does not limit this.
Step 33: the source base station determines the uplink buffer area status information of the terminal to be switched (namely the terminal to be switched). Specifically, the uplink buffer status information of the terminal to be switched may be determined according to any one of the following manners:
mode 1: and determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request. For example, the uplink buffer status reported by the terminal in the last uplink scheduling request is directly used as the current uplink buffer status information of the terminal to be switched.
Mode 2: the source base station determines the current uplink buffer area state information of the terminal to be switched according to the uplink buffer area state information reported before the terminal to be switched, for example, the uplink buffer area state information reported in the uplink scheduling request at the last time, and the uplink scheduling condition of the terminal to be switched after the uplink buffer area state information is reported.
For example, the source base station calculates the last reported uplink buffer status information of the terminal to be switched, and calculates a first data volume of uplink scheduling transmission of the terminal to be switched in the period of time from the last reported uplink buffer status information of the terminal to be switched to the current time (e.g., before the switching request message is sent in step 34), and then calculates a difference value between the last reported uplink buffer status information of the last uplink scheduling request of the terminal to be switched and the first data volume, so as to obtain the current uplink buffer status information of the terminal to be switched.
Mode 3: and receiving the current uplink buffer area state information carried in the last measurement report of the terminal to be switched in the step 31, and determining the current uplink buffer area state information of the terminal to be switched by the source base station directly according to the information.
For example, the uplink buffer status information reported in the measurement report is used as the current uplink buffer status information of the terminal to be switched.
Mode 4: and determining the current uplink buffer area state information of the terminal to be switched according to the buffer area state information carried by the last measurement report and the uplink scheduling condition of the terminal to be switched after the measurement report is reported by combining the mode 2 and the mode 3.
For example, the source base station calculates a second data volume of uplink scheduling transmission of the terminal to be switched during the period from the last measurement report reported by the terminal to be switched to the current time (e.g., before the switching request message is sent in step 34), and then calculates a difference between uplink buffer status information reported in the last measurement report by the terminal to be switched and the second data volume, so as to obtain current uplink buffer status information of the terminal to be switched.
And step 34, the source base station sends a switching request to the target base station to request to switch the terminal to a target cell corresponding to the target base station. The handover request may refer to prior art implementations.
The embodiment of the invention can carry the buffer area state indication information used for indicating the current uplink buffer area state of the terminal in the switching request. Specifically, the buffer status indication information carried in the handover request may be determined according to any one of the following manners:
mode 1: and determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, calculating a first sum of the uplink buffer area states of each LGG, and sending the first sum as the buffer area state indication information to a target base station.
Mode 2: and determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, and sending the uplink buffer area state of part or all LCGs of the terminal to be switched to the target base station as the buffer area state indication information.
Here, the source base station may send, as the buffer status indication information, uplink buffer status information of LCGs whose important levels satisfy a predetermined degree to the target base station according to quality of service (QoS) parameters, such as QoS level identifiers (QCIs) or priorities, corresponding to the respective LCGs.
And step 35, the target base station executes admission judgment according to the switching request, and allocates corresponding uplink resources to the terminal to be switched according to the buffer status indication information when switching is allowed.
Here, the target base station may allocate uplink resources according to the buffer status indication information of the terminal to be switched, for example, when the buffer status indication information indicates that an uplink buffer of the terminal is large, allocate more uplink resources for the terminal to be switched, so as to meet the transmission requirement; and otherwise, when the buffer area state indication information indicates that the uplink buffer area of the terminal is less, allocating less uplink resources for the terminal to be switched so as to avoid wasting resources.
It should be noted that, the embodiment of the present invention enables the target base station to obtain the relevant information of the uplink buffer status of the terminal to be switched, and further perform reasonable resource allocation.
Step 36, the target base station sends a handover response message to the source base station, and the handover response message may carry resource allocation information for indicating the uplink resource.
The target base station may carry time and frequency position indication information of the uplink resource in the resource allocation information, where the time position indication information may be a subframe number of a specific frequency domain resource in effect, or an effective time period (a starting subframe number and a terminating subframe number or a duration), or an effective starting subframe number and period. Optionally, the target base station may also carry the resource end time in the resource allocation information. Of course, in the embodiment of the present invention, the target base station may send the resource allocation information to the source base station through other messages.
Step 37, after receiving the handover response message sent by the target base station, the source base station sends an RRC connection reconfiguration message to the terminal, so as to perform RRC connection reconfiguration. The RRC connection reconfiguration message carries the resource allocation information received in step 36.
And step 38, the terminal establishes the RRC connection with the target base station according to the RRC connection reconfiguration message, switches to the target cell corresponding to the target base station, and transmits uplink data to the target base station by using the uplink resource allocated by the target base station.
Referring to fig. 4, a downlink resource allocation method in a handover process according to an embodiment of the present invention is also applied to a wireless communication system including a terminal, a source base station, and a target base station, and the resource allocation method includes the following steps:
step 41, the terminal performs measurement reporting, for example, reports measurement results of the serving cell and the neighboring cell to the source base station.
And step 42, the source base station performs switching judgment according to the measurement result reported by the terminal in step 41, and determines the target cell and the home base station thereof at this time on the assumption that switching needs to be performed.
And 43, the source base station determines the state information of the downlink buffer area of the terminal to be switched. Specifically, the uplink buffer status information of the terminal to be switched may be determined according to any one of the following manners:
mode 1: and taking the buffer area state of each current downlink RB of the terminal to be switched as the current downlink buffer area state of the terminal to be switched, namely, directly obtaining the current downlink buffer area state of the terminal according to the buffer area state of each current downlink RB of the terminal.
Mode 2: and grouping the current downlink RBs of the terminal to be switched according to the QoS parameters of the RBs, and determining the downlink buffer area state corresponding to each downlink RB group as the current downlink buffer area state of the terminal to be switched.
And step 44, the source base station sends a switching request to the target base station to request to switch the terminal to a target cell corresponding to the target base station.
The embodiment of the invention can carry the buffer area state indication information used for indicating the current downlink buffer area state of the terminal to be switched in the switching request. Specifically, the buffer status indication information carried in the handover request may be determined according to any one of the following manners:
mode 1: when the current downlink buffer area state of the terminal to be switched is the buffer area state of each current downlink RB of the terminal to be switched, calculating a second sum of the buffer area states of each current downlink RB of the terminal to be switched, and sending the second sum to a target base station as the buffer area state indication information; or, according to the buffer area state of each current downlink RB of the terminal to be switched, sending the downlink buffer area state of part or all downlink RBs as the buffer area state indication information to the target base station. For example, the downlink buffer status of the downlink RB part having a higher importance level is transmitted to the target base station according to the QoS-related parameter.
In the mode 2, when the current downlink buffer area state of the terminal to be switched is the buffer area state corresponding to each downlink RB group of the terminal to be switched, calculating a third sum of the buffer area states corresponding to each downlink RB group of the terminal to be switched, and sending the third sum to a target base station as the buffer area state indication information; or, according to the buffer area state corresponding to each current downlink RB group of the terminal to be switched, sending the downlink buffer area state corresponding to part or all of the downlink RB groups to the target base station as the buffer area state indication information. For example, the downlink buffer status of the partial downlink RB group with higher importance level is transmitted to the target base station according to the QoS related parameter.
And step 45, after receiving the switching request sent by the source base station, the target base station makes admission judgment, and if the admission is available, the target base station allocates downlink resources for the switching terminal according to the buffer status indication information carried by the source base station in the switching request message.
For example, when the buffer status indication information indicates that the downlink buffer of the terminal is large, more downlink resources are allocated to the terminal to be switched so as to meet the transmission requirement; otherwise, when the buffer status indication information indicates that the downlink buffer of the terminal is less, allocating less downlink resources for the terminal to be switched, so as to avoid wasting resources.
It should be noted that, the embodiment of the present invention enables the target base station to obtain the relevant information of the uplink buffer status of the terminal to be switched, and further perform reasonable resource allocation.
Step 46, the target base station sends a handover response message to the source base station, where the handover response message may carry resource allocation information for indicating downlink resources allocated to the terminal.
The resource allocation information sent by the target base station to the source base station may carry time and frequency position indication information of the resource, where the time position indication information may be a subframe number in which a specific frequency domain resource takes effect, or an effective time period (a starting subframe number and a terminating subframe number or a duration), or an effective starting subframe number and period. Optionally, the target base station may also carry the resource end time in the resource allocation information. Of course, in the embodiment of the present invention, the target base station may send the resource allocation information to the source base station through other messages.
And step 47, after receiving the handover response message sent by the target base station, the source base station sends an RRC connection reconfiguration message to the terminal, so as to perform RRC connection reconfiguration. The RRC connection reconfiguration message carries the resource allocation information received in step 46.
And step 48, the terminal establishes the RRC connection with the target base station according to the RRC connection reconfiguration message, switches to the target cell corresponding to the target base station, and receives downlink data sent by the target base station by using the downlink resource allocated to the terminal by the target base station.
Referring to fig. 5, a method for allocating uplink and downlink resources in a handover process according to an embodiment of the present invention is applied to a wireless communication system including a terminal, a source base station, and a target base station, and the method for allocating resources allocates uplink and downlink resources to a terminal to be handed over at the same time, as shown in fig. 5, the method includes the following steps:
step 51, the terminal reports the measurement report to the source base station.
Optionally, the terminal may carry the current uplink buffer status information of the terminal in the measurement report.
Step 52, the base station performs handover decision according to the measurement result reported by the terminal in step 51, and determines the target cell to be handed over and the base station to which the target cell belongs.
In step 53, the source base station determines the uplink buffer status information and the downlink buffer status information of the handover terminal.
Here, the manner of determining the uplink buffer status information of the terminal may refer to the implementation in step 33, and the manner of determining the downlink buffer status information of the terminal may refer to the implementation in step 43, and for saving details, details are not repeated here.
And step 54, the source base station sends a switching request to the target base station to request to switch the terminal to a target cell corresponding to the target base station. The handover request may refer to prior art implementations.
Here, the handover request may carry first buffer status indication information for indicating a current uplink buffer status of the terminal and second buffer status indication information for indicating a downlink buffer status.
Specifically, the first buffer status indication information may refer to the implementation in step 34, and the second buffer status indication information may refer to the implementation in step 44, which is not described herein again for brevity.
And step 55, the target base station executes admission judgment according to the switching request, and allocates corresponding uplink resources and downlink resources to the terminal to be switched according to the buffer status indication information when switching is allowed.
Here, the specific uplink and downlink resource allocation manners may refer to the implementation manners in step 35 and step 45, which are not described herein again.
Step 56, the target base station sends a handover response message to the source base station, and the handover response message may carry resource allocation information for indicating the uplink resource and the downlink resource.
Similarly, the resource allocation information may include time and frequency position indication information of uplink/downlink resources, where the time domain position indication information may be a subframe number in which a specific frequency domain resource is effective, or an effective time period (a starting subframe number and a terminating subframe number or a duration), or an effective starting subframe number and period. Optionally, the target base station may also carry the resource end time in the resource allocation information.
And step 57, after receiving the handover response message sent by the target base station, the source base station sends an RRC connection reconfiguration message to the terminal, so as to perform RRC connection reconfiguration. The RRC connection reconfiguration message carries the resource allocation information received in step 56.
And step 58, the terminal establishes the RRC connection with the target base station according to the RRC connection reconfiguration message, switches to the target cell corresponding to the target base station, transmits uplink data to the target base station by using the uplink resource allocated to the terminal by the target base station, and receives downlink data transmitted by the target base station by using the downlink resource allocated to the terminal by the target base station.
Based on the above resource allocation method, an embodiment of the present invention further provides a source base station, where the source base station is a base station to which a current serving cell of a terminal to be switched belongs, and please refer to fig. 6, where the source base station 60 includes:
a buffer status determining unit 61, configured to determine a current buffer status of a terminal to be switched, where the current buffer status includes at least one of an uplink buffer status and a downlink buffer status;
a first sending unit 62, configured to send, according to the current buffer status of the terminal to be switched, buffer status indication information used for indicating the current buffer status of the terminal to be switched to a target base station;
a receiving unit 63, configured to receive resource allocation information returned by the target base station after allocating resources to the terminal to be switched according to the buffer status indication information;
a second sending unit 64, configured to send the resource allocation information to the terminal to be switched.
Optionally, the first sending unit 62 further carries the buffer status indication information in a handover request, and sends the handover request to the target base station; the receiving unit 63 further receives the resource allocation information from a handover response message sent by the target base station; and the second sending unit 64 further carries the resource allocation information in an RRC connection reconfiguration message and sends the RRC connection reconfiguration message to the terminal to be switched.
Optionally, the buffer status determining unit 61 includes:
an upstream buffer status determination unit, configured to, when the buffer status comprises an upstream buffer status:
determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request
Or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request and the uplink scheduling condition of the terminal to be switched after the last uplink scheduling request is reported;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report and the uplink scheduling condition of the terminal to be switched after the last measurement report is reported.
Optionally, the first sending unit 62 includes:
an uplink state sending unit, configured to, when the buffer state includes an uplink buffer state:
determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, calculating a first sum of the uplink buffer area states of each LGG, and sending first buffer area state indication information carrying the first sum to the target base station;
or, determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, and sending second buffer area state indication information carrying the uplink buffer area state of part or all LCGs to the target base station.
In this embodiment of the present invention, when the uplink state sending unit sends the second buffer status indication information to the target base station, the uplink state sending unit further carries the QoS parameters corresponding to part or all of the LCGs in the second buffer status indication information.
Optionally, the buffer status determining unit 61 includes:
a downstream buffer status determination unit, configured to, when the buffer status includes a downstream buffer status:
taking the buffer area state of each current downlink RB of the terminal to be switched as the current downlink buffer area state of the terminal to be switched;
or, according to the QoS parameters of each RB, grouping the current downlink RBs of the terminal to be switched, and determining the downlink buffer area state corresponding to each downlink RB group as the current downlink buffer area state of the terminal to be switched.
Optionally, the first sending unit 62 includes:
a downlink state sending unit, configured to, when the current downlink buffer state of the terminal to be switched is the buffer state of each current downlink RB of the terminal to be switched: calculating a second sum of the buffer status of each current downlink RB of the terminal to be switched, and sending third buffer status indication information carrying the second sum to the target base station; or, according to the buffer status of each current downlink RB of the terminal to be switched, sending fourth buffer status indication information carrying the downlink buffer status of part or all downlink RBs to the target base station; and when the current downlink buffer area state of the terminal to be switched is the buffer area state corresponding to each downlink RB group of the terminal to be switched: calculating a third sum of the buffer status corresponding to each downlink RB group of the terminal to be switched, and sending fifth buffer status indication information carrying the third sum to the target base station; or, according to the buffer area state corresponding to each current downlink RB group of the terminal to be switched, sending sixth buffer area state indication information carrying downlink buffer area states corresponding to part or all downlink RB groups to the target base station.
Here, when the downlink status transmitting unit transmits the fourth buffer status indication information to the target base station, the downlink status transmitting unit further carries the QoS parameters corresponding to the part or all of the downlink RBs in the fourth buffer status indication information; and when the sixth buffer status indication information is sent to the target base station, further carrying the QoS parameters corresponding to the part or all of the downlink RB groups in the sixth buffer status indication information.
The embodiment of the present invention further provides another source base station, where the source base station is a base station to which a current serving cell of a terminal to be switched belongs, and please refer to fig. 7, and the source base station includes:
a first transceiver 71, configured to send, to a target base station, buffer status indication information used for indicating a current buffer status of a terminal to be switched, and receive resource allocation information returned by the target base station after allocating resources to the terminal to be switched according to the buffer status indication information; and sending the resource allocation information to the terminal to be switched.
A first processor 72, configured to determine a current buffer status of a terminal to be switched, where the terminal to be switched executes a switching, where the buffer status includes at least one of an uplink buffer status and a downlink buffer status; and determining buffer area state indication information for indicating the current buffer area state of the terminal to be switched according to the current buffer area state of the terminal to be switched.
Wherein in fig. 7 the bus architecture may comprise any number of interconnected buses and bridges, in particular one or more processors represented by the first processor 72 and various circuits of the memory represented by the first memory 73, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The first transceiver 71 may be a plurality of elements, i.e. including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium.
An embodiment of the present invention further provides a target base station, where the target base station is a base station to which a target cell to be switched to belongs, and please refer to fig. 8, where the target base station 80 includes:
a receiving unit 81, configured to receive buffer status indication information, which is sent by a source base station and used to indicate a current buffer status of a terminal to be switched for performing a handover, where the buffer status includes at least one of an uplink buffer status and a downlink buffer status;
the allocating unit 82 is configured to allocate corresponding resources to the terminal to be switched according to the buffer status indication information;
a sending unit 83, configured to send resource allocation information used for indicating the resource to the source base station.
Preferably, the receiving unit 81 is further configured to receive the buffer status indication information from the handover request sent by the source base station, and the sending unit 83 is further configured to carry the resource allocation information in a handover response message and send the handover response message to the source base station.
The embodiment of the present invention further provides another target base station, where the target base station is a base station to which a target cell to which a terminal to be switched is to be switched belongs, and please refer to fig. 9, where the target base station includes:
a second transceiver 91, configured to receive buffer status indication information sent by a source base station and used for indicating a current buffer status of a terminal to be switched, where the buffer status includes at least one of an uplink buffer status and a downlink buffer status, and send resource allocation information used for indicating the resource to the source base station;
and the second processor 92 is configured to allocate corresponding resources to the terminal to be switched according to the buffer status indication information.
Where in fig. 9 the bus architecture may include any number of interconnected buses and bridges, in particular one or more processors represented by the second processor 92 and various circuits of the memory represented by the second memory 93 linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The second transceiver 91 may be a plurality of elements, i.e. including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium.
In summary, the resource allocation method, the source base station and the target base station in the handover process provided by the embodiment of the present invention enable the target base station to allocate resources more reasonably in the handover process by sending the relevant information of the uplink/downlink buffer status of the terminal from the source base station to the target base station in the handover process.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (20)

1. A method for allocating resources in a handover process is characterized by comprising the following steps:
the method comprises the steps that a source base station determines the current buffer area state of a terminal to be switched, wherein the buffer area state comprises at least one of an uplink buffer area state and a downlink buffer area state;
the source base station sends buffer area state indication information used for indicating the current buffer area state of the terminal to be switched to a target base station according to the current buffer area state of the terminal to be switched;
the source base station receives resource allocation information returned by the target base station after allocating resources to the terminal to be switched according to the buffer area state indication information, wherein the resource allocation information is used for indicating data transmission resources allocated to the terminal to be switched;
and the source base station sends the resource allocation information to the terminal to be switched.
2. The resource allocation method of claim 1,
the source base station further carries the buffer area state indication information in a switching request and sends the switching request to the target base station;
the source base station further receives the resource allocation information from a handover response message sent by the target base station; and the number of the first and second groups,
and the source base station further carries the resource allocation information in an RRC connection reconfiguration message and sends the RRC connection reconfiguration message to the terminal to be switched.
3. The resource allocation method of claim 1,
when the buffer area state comprises an uplink buffer area state, the step of determining the current buffer area state of the terminal to be switched comprises the following steps:
determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request and the uplink scheduling condition of the terminal to be switched after the last uplink scheduling request is reported;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report and the uplink scheduling condition of the terminal to be switched after the last measurement report is reported.
4. The resource allocation method of claim 3,
when the buffer status includes an uplink buffer status, the step of sending, to a target base station, buffer status indication information for indicating the current buffer status of the terminal to be switched according to the current buffer status of the terminal to be switched includes:
determining the uplink buffer area state of each logic channel group LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, calculating a first sum of the uplink buffer area states of each LGG, and sending first buffer area state indication information carrying the first sum to the target base station;
or, determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, and sending second buffer area state indication information carrying the uplink buffer area state of part or all LCGs to the target base station.
5. The resource allocation method of claim 4,
and when the second buffer status indication information is sent to the target base station, further carrying the QoS parameters corresponding to part or all of the LCGs in the second buffer status indication information.
6. The resource allocation method according to any one of claims 1 to 5,
when the buffer area state comprises a downlink buffer area state, the step of determining the current buffer area state of the terminal to be switched comprises the following steps:
taking the buffer area state of each current downlink Radio Bearer (RB) of the terminal to be switched as the current downlink buffer area state of the terminal to be switched;
or, according to the QoS parameters of each RB, grouping the current downlink RBs of the terminal to be switched, and determining the downlink buffer area state corresponding to each downlink RB group as the current downlink buffer area state of the terminal to be switched.
7. The resource allocation method of claim 6,
when the buffer area state comprises a downlink buffer area state, the step of sending buffer area state indication information for indicating the current buffer area state of the terminal to be switched to a target base station according to the current buffer area state of the terminal to be switched comprises the following steps:
when the current downlink buffer area state of the terminal to be switched is the buffer area state of each current downlink RB of the terminal to be switched: calculating a second sum of the buffer status of each current downlink RB of the terminal to be switched, and sending third buffer status indication information carrying the second sum to the target base station; or, according to the buffer status of each current downlink RB of the terminal to be switched, sending fourth buffer status indication information carrying the downlink buffer status of part or all downlink RBs to the target base station;
when the current downlink buffer area state of the terminal to be switched is the buffer area state corresponding to each downlink RB group of the terminal to be switched: calculating a third sum of the buffer status corresponding to each downlink RB group of the terminal to be switched, and sending fifth buffer status indication information carrying the third sum to the target base station; or, according to the buffer area state corresponding to each current downlink RB group of the terminal to be switched, sending sixth buffer area state indication information carrying downlink buffer area states corresponding to part or all downlink RB groups to the target base station.
8. The resource allocation method of claim 7,
when the fourth buffer status indication information is sent to the target base station, the QoS parameters corresponding to the part or all of the downlink RBs are further carried in the fourth buffer status indication information;
and when the sixth buffer status indication information is sent to the target base station, further carrying the QoS parameters corresponding to the part or all of the downlink RB groups in the sixth buffer status indication information.
9. A method for allocating resources in a handover process is characterized by comprising the following steps:
the method comprises the steps that a target base station receives buffer area state indication information which is sent by a source base station and used for indicating the current buffer area state of a terminal to be switched, wherein the buffer area state comprises at least one of an uplink buffer area state and a downlink buffer area state;
and the target base station allocates corresponding data transmission resources for the terminal to be switched according to the buffer area state indication information, and sends resource allocation information for indicating the resources to the source base station, wherein the resource allocation information is used for indicating the data transmission resources allocated for the terminal to be switched.
10. The resource allocation method of claim 9,
the target base station further receives the buffer status indication information from the handover request sent by the source base station, and,
and the target base station further carries the resource allocation information in a switching response message and sends the switching response message to the source base station.
11. A source base station, comprising:
a buffer status determining unit, configured to determine a current buffer status of a terminal to be switched, where the current buffer status includes at least one of an uplink buffer status and a downlink buffer status;
a first sending unit, configured to send, to a target base station, buffer status indication information for indicating a current buffer status of the terminal to be switched according to the current buffer status of the terminal to be switched;
a receiving unit, configured to receive resource allocation information returned by a target base station after allocating resources to the terminal to be switched according to the buffer status indication information, where the resource allocation information is used to indicate data transmission resources allocated to the terminal to be switched;
and the second sending unit is used for sending the resource allocation information to the terminal to be switched.
12. The source base station of claim 11,
the first sending unit is further configured to send the buffer status indication information to the target base station by carrying the buffer status indication information in a handover request;
the receiving unit is further configured to receive the resource allocation information from a handover response message sent by the target base station; and the number of the first and second groups,
and the second sending unit is further used for carrying the resource allocation information in an RRC connection reconfiguration message and sending the RRC connection reconfiguration message to the terminal to be switched.
13. The source base station of claim 11, wherein the buffer status determining unit comprises:
an upstream buffer status determination unit, configured to, when the buffer status comprises an upstream buffer status:
determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last uplink scheduling request and the uplink scheduling condition of the terminal to be switched after the last uplink scheduling request is reported;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report;
or, determining the current uplink buffer area state of the terminal to be switched according to the uplink buffer area state reported by the terminal to be switched in the last measurement report and the uplink scheduling condition of the terminal to be switched after the last measurement report is reported.
14. The source base station of claim 13, wherein the first transmission unit comprises:
an upstream buffer status sending unit, configured to, when the buffer status includes an upstream buffer status:
determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, calculating a first sum of the uplink buffer area states of each LGG, and sending first buffer area state indication information carrying the first sum to the target base station;
or, determining the uplink buffer area state of each LCG of the terminal to be switched according to the current uplink buffer area state of the terminal to be switched, and sending second buffer area state indication information carrying the uplink buffer area state of part or all LCGs to the target base station.
15. The source base station of claim 14,
the uplink buffer status sending unit, when sending the second buffer status indication information to the target base station, further carries the QoS parameters corresponding to part or all of the LCGs in the second buffer status indication information.
16. The source base station according to any of claims 11 to 15, wherein the buffer status determining unit comprises:
a downstream buffer status determination unit, configured to, when the buffer status includes a downstream buffer status:
taking the buffer area state of each current downlink Radio Bearer (RB) of the terminal to be switched as the current downlink buffer area state of the terminal to be switched;
or, according to the QoS parameters of each RB, grouping the current downlink RBs of the terminal to be switched, and determining the downlink buffer area state corresponding to each downlink RB group as the current downlink buffer area state of the terminal to be switched.
17. The source base station of claim 16, wherein the first transmission unit comprises:
a downlink buffer area status sending unit, configured to, when the current downlink buffer area status of the terminal to be switched is a buffer area status of each current downlink RB of the terminal to be switched: calculating a second sum of the buffer status of each current downlink RB of the terminal to be switched, and sending third buffer status indication information carrying the second sum to the target base station; or, according to the buffer status of each current downlink RB of the terminal to be switched, sending fourth buffer status indication information carrying the downlink buffer status of part or all downlink RBs to the target base station; and when the current downlink buffer area state of the terminal to be switched is the buffer area state corresponding to each downlink RB group of the terminal to be switched: calculating a third sum of the buffer status corresponding to each downlink RB group of the terminal to be switched, and sending fifth buffer status indication information carrying the third sum to the target base station; or, according to the buffer area state corresponding to each current downlink RB group of the terminal to be switched, sending sixth buffer area state indication information carrying downlink buffer area states corresponding to part or all downlink RB groups to the target base station.
18. The source base station of claim 17,
when the downlink status sending unit sends the fourth buffer status indication information to the target base station, the downlink status sending unit further carries QoS parameters corresponding to part or all of the downlink RBs in the fourth buffer status indication information; and when the sixth buffer status indication information is sent to the target base station, further carrying the QoS parameters corresponding to the part or all of the downlink RB groups in the sixth buffer status indication information.
19. A target base station, comprising:
a receiving unit, configured to receive buffer status indication information sent by a source base station and used for indicating a current buffer status of a terminal to be switched, where the buffer status includes at least one of an uplink buffer status and a downlink buffer status;
the allocation unit is used for allocating corresponding resources to the terminal to be switched according to the buffer area state indication information;
a sending unit, configured to send resource allocation information indicating the resource to the source base station.
20. The target base station of claim 19,
the receiving unit is further configured to receive the buffer status indication information from the handover request sent by the source base station, and,
the sending unit is further configured to send the resource allocation information to the source base station by carrying the resource allocation information in a handover response message.
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