CN100571208C - A kind of method for obligating resource of realizing multicast/broadcast business - Google Patents
A kind of method for obligating resource of realizing multicast/broadcast business Download PDFInfo
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Abstract
The invention discloses a kind of method for obligating resource of realizing multicast/broadcast business MBS, in wireless communication system, the multicast/broadcast business server at first is data field of each multicast/broadcast region allocation and the quality of service requirement of determining MBS; Each base station is the multicast/broadcast business bandwidth resource; The multicast/broadcast business server is according to pre-assigned data field size and the quality of service requirement that is connected, after multicast/broadcast business admitted the control success and receive descending multicast/broadcast business data, unified scheduling bandwidth resource also sent to each base station in advance with scheduling result information and business datum; The base station is made actual bandwidth in view of the above and is reserved, and reserves and described multicast/broadcast business data according to actual bandwidth, and the group physical layer frame sends to corresponding terminal.The method of the invention has guaranteed the preferential scheduling in time of MBS business, residual resource all can also be distributed to the unicast service that needs scheduling.
Description
Technical field
The present invention relates to field of wireless communications systems, relate in particular to a kind of method for obligating resource of realizing multicast/broadcast business, be applicable to IEEE 802.16 wireless communication systems.
Background technology
IEEE 802.16 protocol definitions a kind of multicast/broadcast business (Multicast BroadcastService, MBS), it can be divided into, and single base station is inserted and two kinds of situations are inserted in many base stations, wherein, single base station is inserted, and is meant the multicast/broadcast business in a base station; Many base stations are inserted, and are meant the identical multicast/broadcast data of a plurality of base station synchronization transmission, and terminal needs can receive data under each base station in the network layer registration.The alleged MBS of the present invention is meant the multicast/broadcast business that this many base stations are inserted.
In order to strengthen reception, one group of base station that many base stations are inserted in the situation must promptly, send identical data in the identical moment synchronously, uses identical transmission mechanism, comprises identical symbol, subchannel, modulation system, grand diversity that Here it is.The multicast/broadcast business that many base stations are inserted generally all adopts the mode of grand diversity to send.
For unicast system, owing to do not need unified scheduling, data dispatch oneself is finished by each base station, is dispatched respectively by the idle wireless resource scheduler of each base station; And for multicast/broadcast business, in order to realize grand diversity, each MBS that is positioned at same multicast/broadcast zone (MBS Zone) connects and must realize unified scheduling by a centrostigma multicast/broadcast business server (MBS Server) earlier, MBS Server multicast/broadcast business scheduler wherein, be responsible for making the as a result construction data of each base station, and guarantee that the transmission of each base station is synchronous in strict accordance with centralized dispatching.
Each base station except needs for grand diversity MBS traffic assignments bandwidth, also need to finish the scheduling of unicast service.Because MBS has influence on the reception of a lot of terminal use's data under each base station, it is important comparatively speaking, but wherein the service priority of part MBS is not the highest.Therefore, in order to realize MBS better, to need a kind of method be the MBS business carries out resource reservation in the admittance control of base station and idle wireless resource scheduling process, to guarantee the smooth realization of MBS business.
Summary of the invention
Technical problem to be solved by this invention is, a kind of method for obligating resource of realizing multicast/broadcast business is provided, in IEEE 802.16 wireless communication systems, can guarantee unified scheduling multicast/broadcast business in the multicast/broadcast zone effectively, resource reservation and synchronized transmission are carried out in each base station, are unlikely to again the unicast service of each base station is made a big impact simultaneously.
The invention provides a kind of method for obligating resource of realizing multicast/broadcast business, be used at the wireless communication system that comprises a multicast/broadcast business server and a plurality of multicast/broadcasts zone, for multicast/broadcast business carries out resource reservation, wherein said multicast/broadcast zone comprises a plurality of base stations and terminal, and described method comprises the steps:
(1) the multicast/broadcast business server pre-determines the quality of service requirement of multicast/broadcast business connection, is multicast/broadcast data district of each multicast/broadcast region allocation in the physical layer frame zone, and the position and the size of the described data field of unified configuration;
(2) each base station is the multicast/broadcast business bandwidth resource;
(3) initiate a newly-built multicast/broadcast business when connecting when terminal or network side, the multicast/broadcast business server, according to the big or small quality of service requirement that is connected with multicast/broadcast business in pre-assigned data field, whether decision allows to set up this multicast/broadcast business connects, if admit successfully, then, this distributes related resource for connecting;
(4) the multicast/broadcast business server is unified scheduling after admitting successfully, connect and receive descending multicast/broadcast business data and to bandwidth resources, and the position, data field that comprises actual use of this multicast/broadcast business, scheduling result information and this multicast/broadcast business data of size are sent to each base station in the lump in advance;
(5) bandwidth resources reserved in advance according to described actual position, data field of using and size and base station of described base station are made actual required RSVP;
(6) described base station is reserved and described multicast/broadcast business data according to actual bandwidth, is organized into physical layer frame and sends it to corresponding terminal.
Described method further can also comprise:
(7) unicast service is given with the redundance bandwidth resource allocation in described base station; Wherein, described redundance bandwidth resources are that described base station is to remove the bandwidth resources of actual bandwidth after reserving in the bandwidth resources reserved in advance of multicast/broadcast business.
Wherein, the base station is that the step of multicast/broadcast business bandwidth resource comprises in the described step (2):
After the multicast/broadcast business server was finished the configuration in multicast/broadcast data district, the quality of service information that data field size that the multicast/broadcast zone is shared and corresponding multicast/broadcast business connect was notified all base stations under this multicast/broadcast zone;
Described base station quality of service information according to pre-configured multicast/broadcast data district size and/or multicast/broadcast business connection when admitting control is that multicast/broadcast business is reserved the corresponding bandwidth resource.
Wherein, the base station is that the step of multicast/broadcast business bandwidth resource comprises in the described step (2):
Described base station takies resource quantity according to the actual average that multicast/broadcast business connects, for multicast/broadcast business is reserved the corresponding bandwidth resource.
Beneficial effect of the present invention comprises:
(1) adopts MBS method for obligating resource provided by the invention, QoS (service quality) restriction that MBS data field by a pre-configured fair-sized is connected with MBS, in MBS Server the MBS establishment of connection has been carried out admitting control, can guarantee effectively not can be professional and scheduling causes very big influence to unicast service because a large amount of paroxysmal MBS occurring;
(2) adopt MBS method for obligating resource provided by the invention, because MBS Server has sent to the base station with MBS data and centralized dispatching object information in advance, the base station scheduling part is carried out the MBS data field resource reservation of actual every frame in advance, thereby can guarantee effectively that the MBS business can preferentially obtain scheduling in the interface-free resources scheduling process of base station, and give other unicast services with unnecessary bandwidth reasonable distribution, improve resource utilization;
(3) employing MBS method for obligating resource provided by the invention because the base station is that the MBS that possible set up connects reserved resource unicast service being done to admit when controlling, thereby need can guarantee the power that is created as of unified MBS business of dispatching.
Description of drawings
Fig. 1 is the schematic diagram that terminal receives the MBS data procedures;
Fig. 2 is the logical construction block diagram that the MBS business is carried out scheduling process;
Fig. 3 is the flow chart that the MBS business is carried out resource reservation according to the present invention;
Fig. 4 is the exemplary plot that the control resource reservation is admitted in the base station;
Fig. 5 is the MBS data field resource reservation exemplary plot of physical layer frame scheduling.
Embodiment
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
As shown in Figure 1, the process that has shown terminal reception MBS data in IEEE 802.16 wireless communication systems.In Fig. 1,100 is a MBS zone (MBS Zone), 101,102 and 103 is three adjacent base stations, 104 and 105 is two terminals that receive the MBS data, the 106th, the route that terminal 105 moves, the 107th, the IAD of unified management MBS also comprises MBSServer in the system, it is a functional entity, generally resides on the IAD 107.Wherein:
Base station 101,102 and 103 belongs to MBS zone 100, the identical MBS data of transmission that the three is synchronous;
Terminal 104 and 105 adds same MBS and is connected, and receives identical multicast/broadcast data;
The MBS that sets up in the IAD 107 unified management MBS zone 100 connects, and sends identical MBS packet to three base stations.
When terminal 105, need not to rebulid MBS and connect when 102 overlay areas move to 103 overlay areas, base station from the base station on the route 106, that is to say, need not to take place the switching of MBS join dependency.When terminal 105 is between base station 102 and 103 zone, receive the MBS data that two base stations send simultaneously, reach the effect that diversity merges, thereby improve receptivity.
Fig. 2 is the logical construction block diagram of MBS scheduling.The multicast/broadcast business scheduler 204 that the MBS scheduling relates to is arranged in multicast/broadcast business server 200, and idle wireless resource scheduler 205,206 and 207 lays respectively in base station 201,202 and 203.The idle wireless resource scheduler of base station is mainly finished the scheduling of unicast service and the frame scheduling of physical layer.MBS service dispatcher 204 is mainly finished the centralized and unified scheduling of MBS, and sends the data to terminal by base station dispatcher.
As shown in Figure 3, in order to carry out resource reservation in the admittance control of base station and idle wireless resource scheduling process, to guarantee the smooth realization of MBS business, method for obligating resource provided by the present invention may further comprise the steps:
Step 301: the multicast/broadcast business server is according to the multicast/broadcast business characteristics, pre-determine the quality of service requirement that multicast/broadcast business connects, in the physical layer frame zone multicast/broadcast data district of each multicast/broadcast region allocation, and the position and the size of the described data field of unified configuration.Distribute the position and the size of data field unitedly by MBSServer, can guarantee that the different data field, base station that belongs to a plurality of Zone does not have overlapping.
Step 302: each base station is the multicast/broadcast business bandwidth resource.
The base station when being the MBS bandwidth resource, the resource reservation policy a or the b that can adopt, respectively as follows:
A, MBS Server are after configuring MBS Zone, can be with the size and the professional QoS (service quality that connects of corresponding M BS of this shared data field of MBS Zone, Quality of Service) information is notified all base stations under this MBS Zone, and the base station can be the professional corresponding bandwidth resource of reserving of MBS according to pre-configured MBS data field size and/or the professional QoS of connection of MBS information when admitting control;
Or b, base station adopt other strategy to be the MBS bandwidth resource, take resource such as connecting actual average according to MBS in ought be for the previous period, is defined as MBS and reserves enough bandwidth resources.Such as no matter whether current have MBS to connect, support the base station of MBS all will connect the resource of reserving whole system 10% for MBS.
Step 303: multicast/broadcast business server, when terminal or network side are initiated a newly-built multicast/broadcast business when connecting, according to the big or small quality of service requirement that is connected with multicast/broadcast business in pre-configured data field, whether decision allows to set up this multicast/broadcast business connects, if admit successfully, then connect distributing radio resource for this.
Initiate a newly-built MBS when connecting when the terminal in this MBS Zone or network side, MBSServer does and admits control, and MBS Server determines whether to allow to set up this connection according to the qos requirement that pre-configured MBS data field size restriction is connected with MBS.If admit successfully, for this connects distributing radio resource.Described admittance control can be regarded as the own control procedure that connects, and mainly is the service quality of judging that can current system resource meet the demands, and connects.
Step 304: the multicast/broadcast business server is after admitting successfully, connect and receive descending multicast/broadcast business data, bandwidth resources are unified scheduling, and the position, data field that comprises actual use of this multicast/broadcast business, scheduling result information and this multicast/broadcast business data of size are sent to each base station in the lump in advance.
If connecting, sets up successfully MBS, and MBS Server receives descending MBS data, so, at first carry out the unified scheduling of bandwidth, scheduling result information such as the position, data field of the actual use of this MBS, size and MBS data are sent to the base station together in advance by MBS Server.
Step 305: the bandwidth resources that described base station is reserved in advance according to this position, data field and size and base station, make actual required RSVP.
After actual required position, described data field and size were received in the base station, the base station resource scheduler was made actual RSVP according to this position, data field and size, the bandwidth resources that actual usually RSVP should be reserved in advance less than the base station.
Step 306: described base station is reserved and described multicast/broadcast business data according to actual bandwidth, is organized into physical layer frame and sends it to corresponding terminal.
Described step 301-303 is mainly the admittance process in the described method, and step 304-306 then can be used as the actual schedule process.Below further detailed describing respectively in the method for obligating resource of the present invention, the specific implementation of admitting the resource reservation of MBS data field in MBS resource reservation in the control procedure and the actual schedule process.
One, admits the MBS resource reservation of control procedure.
For unicast service,, can admit if base station resource is limited, and for multicast/broadcast business, because the unified scheduling of whole M BS Zone, the MBS establishment of connection should not be limited by inadequate resource on certain base station, and this brings difficulty just for the admittance control of base station.
Admit the problem of difficulty at this, a kind of solution that the present invention has provided is as follows:
(1) connection limits the admittance control module of base station to MBS, and whether the MBS connection admits is fully determined according to professional QoS that connects of MBS and the bandwidth usage of current MBS by the admittance control module of MBS Server;
(2) the admittance control module of base station judges whether that according to the MBS bandwidth reserved that current MBS connects the occupied bandwidth situation and determines in advance unnecessary bandwidth resources can allow to insert clean culture and connect.
Because MBS will not consider the loading condition of any base station when setting up, if still exist under the situation of certain bandwidth of base station deficiency, can determine it is that MBS is preferential, or other unicast service be preferential according to concrete service conditions.The base station is when carrying out unicast service admittance control, bandwidth reserved can be determined according to the MBS data field size and/or the MBS connection QoS information of MBS Zone configuration, also can adopt other strategies to determine, for example, connect dynamically some resources that reserve of QoS more according to current MBS by the base station.
Fig. 4 has shown a kind of base station admittance control section resource reservation exemplary plot, and the abscissa express time among the figure, ordinate represent to take base station system total capacity (admittance ability) percentage.The vertical moulding dash area is represented the actual resource percentage that takies of MBS, and pure gray shade represents that partly base station system is the actual reserved resource of MBS when admitting control.In a period of time, can count the MBS actual average and take resource percentage from the actual resource percentage that takies of MBS, can be defined as the actual reserved resource of MBS as benchmark.What example showed among Fig. 4 is that actual reserved resource takies resource greater than the MBS actual average that counts, and less than the situation in pre-configured MBS reserved data district.
Adopt this measure can either guarantee when new Multimedia Broadcast Multicast Service request is arranged, the base station has enough resource reservation to guarantee the successful foundation of Multimedia Broadcast Multicast Service, because connecting MBS, MBS Server carried out admitting control simultaneously, whether allow professional connection of MBS to set up by MBS Server decision, the MBS resource requirement may be limited in the certain limit, also is unlikely to admit control to bring difficulty for the unicast service of base station when a lot of sudden MBS service request.
Two, the resource reservation of MBS data field in the actual schedule process.
The MBS data that result that the MBS scheduler of MBS Server will be unified to dispatch and system are received shift to an earlier date several frames and send to each base station.The interface-free resources scheduler of each base station needs the preferential MBS of assurance data to send in designated frame, therefore, base station dispatcher can determine that the MBS actual bandwidth takies situation in this frame according to a certain frame real data and centralized dispatching object information that MBS Server sends in advance, so that make accurate actual resource reservation.
Fig. 5 is the frame segment exemplary plot that physical layer adopts orthogonal frequency division multiplexing multiple access access technology (OFDMA), the distribution condition that has shown base station resource in the every frame scheduling process of MBS, the grey black dash area is that the base station is the data field that MBS reserves in advance when admitting control among the figure, but MBS Server is after fulfiling the MBS scheduling ahead of schedule, MBS data and scheduling result information are sent to the base station, base station dispatcher is determined the actual bandwidth reserved of this frame MBS according to this information that receives, and in the back during this frame of actual schedule, many reserved resource are distributed to unicast service 1 (left diagonal line hatches part) and unicast service 2 (right diagonal line hatches part) uses.
Method of the present invention, adopt MBS Server to shift to an earlier date the method that several frames send to MBS data and centralized dispatching object information the base station, not only can guarantee the preferential scheduling in time of MBS business effectively, can also allow base station dispatcher reasonably arrange the real resource of each frame, residual resource is all distributed to the unicast service that needs scheduling, utilized bandwidth of air-interface fully.
Claims (4)
1, a kind of method for obligating resource of realizing multicast/broadcast business, be used at the wireless communication system that comprises a multicast/broadcast business server and a plurality of multicast/broadcasts zone, for multicast/broadcast business carries out resource reservation, wherein said multicast/broadcast zone comprises a plurality of base stations and terminal, it is characterized in that described method comprises the steps:
(1) the multicast/broadcast business server pre-determines the quality of service requirement of multicast/broadcast business connection, is multicast/broadcast data district of each multicast/broadcast region allocation in the physical layer frame zone, and the position and the size of the described data field of unified configuration;
(2) each base station is the multicast/broadcast business bandwidth resource;
(3) initiate a newly-built multicast/broadcast business when connecting when terminal or network side, the multicast/broadcast business server, according to the big or small quality of service requirement that is connected with multicast/broadcast business in pre-assigned data field, whether decision allows to set up this multicast/broadcast business connects, if admit successfully, then, this distributes related resource for connecting;
(4) the multicast/broadcast business server is after admitting successfully, connect and receive descending multicast/broadcast business data, bandwidth resources are unified scheduling, and the position, data field that comprises actual use of this multicast/broadcast business and scheduling result information and these multicast/broadcast business data of size are sent to each base station in the lump in advance;
(5) bandwidth resources reserved in advance according to described actual position, data field of using and size and base station of described base station are made actual required RSVP;
(6) described base station is reserved and described multicast/broadcast business data according to actual bandwidth, is organized into physical layer frame and sends it to corresponding terminal.
2, the method for claim 1 is characterized in that, described method further comprises:
(7) unicast service is given with the redundance bandwidth resource allocation in described base station; Wherein, described redundance bandwidth resources are that described base station is that the bandwidth resources that multicast/broadcast business is reserved are in advance removed actual bandwidth reservation bandwidth resources afterwards.
3, the method for claim 1 is characterized in that, the step that the middle base station of step (2) is the multicast/broadcast business bandwidth resource comprises:
After the multicast/broadcast business server was finished the configuration in multicast/broadcast data district, the quality of service information that data field size that the multicast/broadcast zone is shared and corresponding multicast/broadcast business connect was notified all base stations under this multicast/broadcast zone;
Described base station quality of service information according to pre-configured multicast/broadcast data district size and/or multicast/broadcast business connection when admitting control is that multicast/broadcast business is reserved the corresponding bandwidth resource.
4, the method for claim 1 is characterized in that, the step that the middle base station of step (2) is the multicast/broadcast business bandwidth resource comprises:
Described base station takies resource quantity according to the actual average that multicast/broadcast business connects, for multicast/broadcast business is reserved the corresponding bandwidth resource.
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| CN101729363B (en) * | 2008-10-21 | 2012-05-30 | 华为技术有限公司 | Method for initializing resource, device and system |
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