CN103428786A - Up-loading information acquiring method and device - Google Patents
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Abstract
The invention provides an up-loading information acquiring method and device. The up-loading information acquiring method and device are used in an uplink coordinated multi-point (ULCoMP) scene. The method comprises the steps that the fact that whether random access is needed is judged in a hand-off process in which switching from a source base station to a target base station is carried out; user equipment acquires up-loading information when random access is not needed; the first time of up-loading is carried out between the user equipment and the target base station based on the up-loading information, wherein the up-loading information comprises uplink resource allocation information and the time of the first time of up-loading. According to the up-loading information acquiring method, the up-loading information can be acquired in a switching process free of random access so that the first time of up-loading between the user equipment and the target base station can be achieved as soon as possible, and then data interrupt time is further shortened during hand-off.
Description
Technical field
The present invention relates to obtain in uplink coordinated multi-point (UL CoMP) method and apparatus of uplink transmission information, relate in particular to the method and apparatus that obtains uplink transmission information in the handover procedure without random access (RACH-less).
Background technology
At present, CoMP WI (CoMP WorkItem, multipoint cooperative standardisation process) proceeds on wireless group 1 (RAN1) and wireless group 2 (RAN2).The theme of RAN2 is the random access of the nothing handoff procedure (RACH-less HO procedure) about UL CoMP scene, be subscriber equipment (UE) from cell-of-origin to handoff procedure (the Handover procedure of Target cell, HO procedure) do not need in to access at random (RACH procedure), thereby shorten handover break period.
The technology patent of invention that the number of being disclosed has been CN101815328A of this RACH-less HO procedure is announced.As this patent of invention is put down in writing, in general, subscriber equipment is switched to from source base station the trial that target BS will be carried out RACH (random access procedure) access.The RACH transmission is transmission time and the power of carrying out uplink first in order to realize the uplink synchronous of user and Target cell, to obtain in Target cell, so that target BS can correctly receive the transmission from this user's up link.
Uplink coordinated multi-point (UL CoMP) transmission is widely used as improving a kind of alternative approach of the uplink performance of Long Term Evolution-senior project (LTE-advanced, Long Term Evolution-Advanced) system in 3GPP36.814.In UL CoMP scene, a plurality of base stations (being called the CoMP group of base stations) are configured to receive the transmission of same subscriber equipment, and carry out relevant merging process, to improve systematic function.This means that all base stations that the CoMP group of base stations comprises all can receive the uplink of respective user equipment, that is to say, this subscriber equipment with the CoMP group of base stations in all base stations realized uplink synchronous.
Generally speaking, the community that in UL CoMP group of base stations, base station covers is to have to the reasonable community of the channel quality of subscriber equipment.
In handover, a major criterion of select target base station is to select to have to the base station of the high channel quality of respective user equipment.Therefore, to belong to the possibility of UL CoMP group of base stations very high for the selected handover-target base station of source base station.In the situation that target BS belongs to UL CoMP group of base stations, because subscriber equipment has been realized uplink synchronous with this target BS, so no longer need the RACH access procedure.That is to say, in the LTE-advanced system of using UL CoMP, handover procedure does not need the possibility of RACH transmitting procedure very high.Just be based on above-mentioned situation, thereby the CN101815328A patent of invention has proposed when handover to omit by UL CoMP information the method that the RACH access procedure shortens handover break period, accelerates the subscriber equipment handoff procedure.
But, as everyone knows, in traditional handoff procedure, the RACH process can send arbitrary access response (Random Access Response to subscriber equipment, RAR), this RAR comprises the information for uplink such as ascending resource assignment information and the time of uplink first (UL Tx Timing), thereby subscriber equipment can carry out the uplink first (UL Tx) between subscriber equipment and target BS based on above-mentioned uplink transmission information, and the HO that for example subscriber equipment sends to target BS completes information (HandOver complete message).And owing to having omitted the RACH process in RACH-less HO technology, therefore, subscriber equipment just can't obtain ascending resource assignment information and the uplink time for completing uplink first, thereby can't realize the first uplink of subscriber equipment to target device.
Just be based on the existence of the problems referred to above, needing in the industry a kind of method and apparatus that obtains uplink transmission information in the handover procedure without random access (RACH-less) badly.
Summary of the invention
An object of the present invention is to propose a kind of method and apparatus that obtains uplink transmission information of novelty, for the scene of uplink coordinated multi-point transmission, thereby obtain uplink transmission information in the handoff procedure without random access, realize the uplink first between subscriber equipment and target BS.
One embodiment of the present of invention provide a kind of method of obtaining uplink transmission information, scene for uplink coordinated multi-point UL CoMP, comprise: during from source base station, being switched to the handover procedure of target BS, judge whether to carry out random access procedure; In the situation that do not need to carry out random access procedure, subscriber equipment obtains uplink transmission information; And carry out the uplink first between described subscriber equipment and described target BS based on described uplink transmission information.
Preferably, described uplink transmission information comprises: ascending resource assignment information and the time of uplink first.
Preferably, by switching command, obtain described ascending resource assignment information, further comprise: in handoff preparation phase, by described target BS, distribute described ascending resource assignment information; Described ascending resource assignment information is included in described switching command, and described switching command is generated and is sent to described subscriber equipment by described source base station by described target BS; And thereby described subscriber equipment receives described switching command and obtains described ascending resource assignment information.
Preferably, obtain described ascending resource assignment information by physical downlink control channel PDCCH, further comprise: the sign by described target BS based on described subscriber equipment is sent described physical downlink control channel PDCCH, and described PDCCH comprises described ascending resource assignment information; Described subscriber equipment is monitored described PDCCH according to the sign of described subscriber equipment, and obtains described ascending resource assignment information.
Preferably, the every Transmission Time Interval TTI of described PDCCH is sent out or periodically is sent out.
Preferably, by dispatch request, obtain described ascending resource assignment information, further comprise: the switching command that comprises the dispatch request configuration information is sent to described subscriber equipment; Described subscriber equipment sends described dispatch request to described target BS; Described target BS sends described resource allocation information to described subscriber equipment.
Preferably, by switching command, obtain the time of uplink first, further comprise: when uplink coordinated multi-point transmission, also when carrying out, described target BS calculates timing advance TA value based on described uplink coordinated multi-point transmission; Described TA value is included in described switching command, and described switching command is generated and sent to described subscriber equipment by described source base station by described target BS; And, thereby receiving described switching command, described subscriber equipment obtains described TA value, the described time of uplink is first determined by described TA value.
Preferably, described TA value is absolute value or relative value.
Preferably, when described TA value is absolute value, the described time of uplink is first determined by described TA value.
Preferably, when described TA value is relative value, the described time of uplink was first determined by described TA value and current uplink time.
Preferably, if current TA value meets the demands, the described time of uplink is first determined by current TA value.
Preferably, judge whether to need the step of random access further to comprise: if the switching command received comprises RACH, to omit indication and/or TA value, perhaps described target BS is included in current uplink coordinated multi-point group of base stations, and described subscriber equipment judgement does not need described random access.
Preferably, described RACH omits indication by described target BS generation.
Preferably, after relevant handover configurations completes, described subscriber equipment will be with the descending carrier of described target BS up time reference and the path loss benchmark as next uplink.
Another embodiment of the present invention provides a kind of subscriber equipment, comprising: the random access procedure judge module, during from source base station, being switched to the handover procedure of target BS, judges whether to carry out random access procedure; Acquisition module, in the situation that do not need to carry out random access procedure, obtain uplink transmission information; And transport module, carry out the uplink first between described subscriber equipment and described target BS based on described uplink transmission information.
Another embodiment of the present invention provides a kind of base station, comprising: access at random judge module, during from source base station, being switched to the handover procedure of target BS, judge whether subscriber equipment needs to carry out random access procedure; Sending module, in the situation that do not need to carry out random access procedure, send uplink transmission information; Wherein, described uplink transmission information is for carrying out the uplink first between subscriber equipment and described target BS.
For the subscriber equipment in the LTE-advanced standard, according to the inventive method, thereby can obtain uplink transmission information in the handoff procedure without random access and realize as soon as possible the uplink first between subscriber equipment and target BS, shorten further the data break period in handover procedure.
The accompanying drawing explanation
Fig. 1 obtains the schematic block diagram of the subscriber equipment 10 of uplink transmission information according to an embodiment of the invention in handover procedure;
Fig. 2 obtains the schematic block diagram of the target BS 20 of uplink transmission information according to an embodiment of the invention in handover procedure;
Fig. 3 obtains the signaling flow graph of uplink transmission information according to an embodiment of the invention in handover procedure; And
Fig. 4 obtains the flow chart of uplink transmission information according to an embodiment of the invention in handover procedure.
Embodiment
Spirit for a better understanding of the present invention, be described further it below in conjunction with part preferred embodiment of the present invention.
Fig. 1 obtains the schematic block diagram of the subscriber equipment 10 of uplink transmission information according to an embodiment of the invention in handover procedure; Fig. 2 obtains the schematic block diagram of the target BS 20 of uplink transmission information according to an embodiment of the invention in handover procedure.
Subscriber equipment 10
In subscriber equipment 10 according to the embodiment of the present invention, comprise random access procedure judge module 12, acquisition module 14 and sending module 16.Random access procedure judge module 12, for be switched to the handover procedure of target BS from source base station, judges whether subscriber equipment needs to carry out random access procedure.Particularly, if the switching command received comprises random access (RACH), omit indication, judgement does not need to access at random.This RACH omits indication and is produced by relevant judgement by target BS.
If have RACH to omit indication in the switching command received, subscriber equipment can not need to access at random according to being included in timing advance (Timer Advanced, TA) in switching command value judging yet.
Perhaps, if both do not had RACH to omit indication in the switching command received, there is no the TA value yet, user equipment side can also be included in current uplink coordinated multi-point group of base stations and judge and do not need to access at random according to target BS, and directly by current TA value, carries out uplink first.But in this case, if from target BS, do not receive any response in the given time, the subscriber equipment judgement need to access at random.If need to access at random, subscriber equipment accesses and completes handoff procedure at random according to existing technology.
This ascending resource assignment information can be passed through switching command, PDCCH or dispatch request and obtain, and particular content will be explained below.
The TA value that this time of uplink first can be calculated by target BS is determined, and is sent to the equipment user by switching command.This TA value is the previously mentioned TA value that can be used for judging whether to carry out random access namely.Due to the TA value, for determining the time of uplink first, therefore, subscriber equipment identification switching command comprises that the TA value can think and not need random access procedure.
In the situation that do not comprise the TA value in the switching command received, this time of uplink first also can be determined by the current TA value of user equipment side.Particular content will be explained below.
Sending module 16, the uplink transmission information obtained based on this carries out the uplink first between subscriber equipment and target BS, and for example subscriber equipment 10 sends to target BS 20 information of switching.
Target BS 20
In target BS 20 according to the embodiment of the present invention, comprise random access judge module 22 and uplink transmission information sending module 24.
Random access judge module 22, during from source base station, being switched to the handover procedure of target BS, judge whether subscriber equipment needs to carry out random access procedure.For example, if the selected target BS of subscriber equipment belongs to the CoMP group of base stations of subscriber equipment, think and can not need random access procedure.Particular content has a detailed description in the CN101815328A patent of invention.
Do not need random access if access at random judge module 22 judgements, target BS 20 is included in switching command RACH omission indication and/or TA value to notify described subscriber equipment.That is to say, target BS 20 can omit indication with RACH and come notifying user equipment to omit the RACH access procedure as special instructions.Perhaps, target BS 20 omits indication without RACH and notifies, and only at switching command, comprises that the TA value comes notifying user equipment to omit the RACH process.When subscriber equipment receives switching command and recognizes the TA value, think that subscriber equipment does not need to access at random.This TA value is obtained according to uplink coordinated multi-point transmission calculating by target BS 20.
Uplink transmission information sending module 24, in the situation that random access judge module 22 judgements do not need to carry out random access procedure, send uplink transmission information to subscriber equipment 10.Wherein, uplink transmission information is for carrying out the uplink first between described subscriber equipment and described target BS.As mentioned above, will be explained below.
Fig. 3 obtains the signaling flow graph of uplink transmission information according to an embodiment of the invention in handover procedure; Fig. 4 obtains the flow chart of uplink transmission information according to an embodiment of the invention in handover procedure.
At first, source base station receives the measurement report about channel quality from subscriber equipment.When channel quality is deteriorated, source base station is judged and will be carried out handover.Now, in step S41, source base station comes the select target base station according to predetermined handover-target base station choice criteria.Then, in step S42, source base station sends hand-off request to determined target BS.
In step S43, target BS is carried out pre-defined algorithm and judgement when receiving hand-off request, and producing switching command (HandOver Command, HO order), this switching command has comprised the uplink transmission information order that RACH omits indication and this subscriber equipment.This uplink transmission information comprises the ascending resource assignment information and for determining the TA value of the time of uplink first.
Particularly, in this step, target BS judges whether to carry out the RACH access procedure.If judgement does not need the RACH access procedure, produce RACH and omit indication.For example, whether target BS, when receiving hand-off request, according to the judged result in hand-off request, identifies self and is included in the CoMP group of base stations.If target BS is included in UL CoMP group of base stations, mean that this subscriber equipment has accessed target BS, produce RACH and omit indication.
Simultaneously, owing to not needing the RACH access procedure, target BS also needs this user equipment allocation ascending resource assignment information and calculates the TA value.Ascending resource assignment information and TA value are all for realizing the uplink first between subscriber equipment and target BS.
In the present embodiment, when uplink coordinated multi-point transmission, also when carrying out, target BS calculates this TA value according to this uplink coordinated multi-point transmission.This TA value can be absolute value or relative value.When this TA value is absolute value, the time of uplink is first determined by this TA value.When described TA value is relative value, the time of uplink was first determined by this TA value and current uplink time.Subscriber equipment sends upstream data according to the time of uplink first of determining to target BS, and target BS just can correctly receive this upstream data.
Therefore, target BS will comprise that the handoff command of above-mentioned RACH omission indication, ascending resource assignment information and TA value sends to source base station (step S43).
In step S44, the HO order that source base station sends target BS sends to subscriber equipment.
In step S45, subscriber equipment is when receiving the HO order, and the RACH based in this HO order omits indication and judges whether to carry out the RACH access procedure.
In step S46, in the situation that do not need to carry out the RACH access procedure, the ascending resource assignment information that the based target base station provides and TA value, subscriber equipment can directly send uplink first, for example handoff completion message to target BS.
In step 47, target BS completes response message to subscriber equipment feedback handover.Thereby whole handoff procedure finishes.
In above-described embodiment, the ascending resource assignment information that target BS distributes sends to subscriber equipment by the HO order.In other embodiments, this ascending resource assignment information can not be placed in the HO order.For example, in the HO order that subscriber equipment identification receives, there is no the ascending resource assignment information, the sign (C-RNIT) started according to subscriber equipment is monitored the Physical Downlink Control Channel (PDCCH) that target BS sends.Target BS can send or periodically send PDCCH by the every Transmission Time Interval of sign based on subscriber equipment (Transmission Time Ihternal, TTI), and has comprised the ascending resource assignment information at this PDCCH.Here, the sign of subscriber equipment refers to by target BS and distributes to this subscriber equipment and send to the sign of subscriber equipment by the HO order, rather than the existing sign of being distributed to subscriber equipment by source base station of subscriber equipment.This PDCCH of correctly demodulation of the sign of subscriber equipment based on this subscriber equipment, thus this ascending resource assignment information obtained.
In a further embodiment, subscriber equipment can also pass through dispatch request (sechule request, SR) and obtains this ascending resource assignment information.Particularly, target BS will comprise that the HO order of dispatch request configuration information (SR configuration) sends to subscriber equipment; Subscriber equipment sends dispatch request (SR request) to target BS; Target BS receives this SR request and just knows that this subscriber equipment has been switched to Target cell, to subscriber equipment, sends the ascending resource assignment information.
In the above-described embodiments, the TA value is calculated and is obtained and be sent to subscriber equipment by the HO order by target BS.In other embodiments, if user equipment side judges current TA value, meet the demands, the time of uplink first can be determined by current TA value, and need to not obtain from the target BS side.
In traditional method or system of needing the RACH access procedure, after subscriber equipment access target BS, the up downlink system block of information 2 (DL SIB2) that is linked to of PRACH Tx is used as new up time reference.For nothing access handoff procedure, even without the RACH process, subscriber equipment also should turn to target BS as its up time reference.That is to say, after relevant handover configurations, subscriber equipment will turn to target BS and use up time reference (UL timing reference) and the path loss benchmark (PL reference) of the descending carrier of target BS as next uplink (UL Tx).
The embodiment more than provided is illustrated with the flow process of ad hoc approach and the example that consists of of equipment.It is pointed out that the present invention is not limited to the particular order of steps of the method schematically illustrated, other sequence of steps is also feasible.Certainly, although above description relates to a plurality of modules, by add a domestic Module Division be a plurality of modules or a plurality of modules are combined as to a module, as long as it still can carry out corresponding function, also can realize the present invention.
It is pointed out that due to the development of technology and the renewal of standard, the parts with identical function often have a plurality of different addresses.The technical term used in application for patent of the present invention is in order to explain and to demonstrate technical scheme of the present invention, should being as the criterion with the function of being known together in its this area, and can not only understanding arbitrarily with the similarities and differences of title.
Technology contents of the present invention and technical characterstic disclose as above, yet those of ordinary skill in the art still may be based on teaching of the present invention and announcements and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications, and is contained by present patent application claims.
Claims (31)
1. a method of obtaining uplink transmission information, the scene for ascending multi-point collaboration comprises:
During from source base station, being switched to the handover procedure of target BS, judge whether to carry out random access procedure;
In the situation that do not need to carry out random access procedure, subscriber equipment obtains uplink transmission information; And
Carry out the uplink first between described subscriber equipment and described target BS based on described uplink transmission information.
2. the method for claim 1, wherein described uplink transmission information comprises: ascending resource assignment information and the time of uplink first.
3. method as claimed in claim 2, wherein, obtain described ascending resource assignment information by switching command, further comprises:
In handoff preparation phase, by described target BS, distribute described ascending resource assignment information;
Described ascending resource assignment information is included in described switching command, and described switching command is generated and is sent to described subscriber equipment by described source base station by described target BS; And
Thereby described subscriber equipment receives described switching command and obtains described ascending resource assignment information.
4. method as claimed in claim 2, wherein, obtain described ascending resource assignment information by physical downlink control channel PDCCH, further comprises:
Sign by described target BS based on described subscriber equipment is sent described physical downlink control channel PDCCH, and described PDCCH comprises described ascending resource assignment information; And
Described subscriber equipment is monitored described PDCCH according to the sign of described subscriber equipment, and obtains described ascending resource assignment information.
5. method as claimed in claim 4, wherein, the every Transmission Time Interval TTI of described PDCCH is sent out or periodically is sent out.
6. method as claimed in claim 2, wherein, obtain described ascending resource assignment information by dispatch request, further comprises:
The switching command that comprises the dispatch request configuration information is sent to described subscriber equipment;
Described subscriber equipment sends described dispatch request to described target BS; And
Described target BS sends described resource allocation information to described subscriber equipment.
7. method as claimed in claim 2, wherein, obtain the time of uplink first by switching command, further comprises:
When ascending multi-point collaboration transmission, also when carrying out, described target BS calculates timing advance TA value based on described ascending multi-point collaboration transmission;
Described TA value is included in described switching command, and described switching command is generated and sent to described subscriber equipment by described source base station by described target BS; And
Thereby described subscriber equipment receives described switching command and obtains described TA value, the described time of uplink is first determined according to described TA value.
8. method as claimed in claim 7, wherein, described TA value is absolute value or relative value.
9. method as claimed in claim 8, wherein, when described TA value is absolute value, the described time of uplink is first determined by described TA value.
10. method as claimed in claim 8, wherein, when described TA value is relative value, the described time of uplink was first determined by described TA value and current uplink time.
11. method as claimed in claim 2, wherein, if current TA value meets the demands, the described time of uplink is first determined by current TA value.
12. the method for claim 1, wherein, judge whether to need the step of random access further to comprise: if the switching command received comprises RACH, to omit indication and/or TA value, perhaps described target BS is included in current ascending multi-point collaboration group of base stations, and described subscriber equipment judgement does not need described random access.
13. method as claimed in claim 12, wherein, described RACH omits indication and is produced by described target BS.
14. the method for claim 1, wherein after relevant the switching, described subscriber equipment will be with the descending carrier of described target BS up time reference and the path loss benchmark as uplink.
15. a subscriber equipment comprises:
Judge module, during from source base station, being switched to the handover procedure of target BS, judge whether to carry out random access procedure;
Acquisition module, in the situation that do not need to carry out random access procedure, obtain uplink transmission information; And
Sending module, carry out the uplink first between described subscriber equipment and described target BS based on described uplink transmission information.
16. subscriber equipment as claimed in claim 15, wherein, described uplink transmission information comprises: ascending resource assignment information and the time of uplink first.
17. subscriber equipment as claimed in claim 16, wherein, described acquisition module obtains described ascending resource assignment information by switching command, and described switching command is generated and sent to described subscriber equipment by described source base station by described target BS.
18. subscriber equipment as claimed in claim 16, wherein, described acquisition module sends PDCCH and obtains described ascending resource assignment information by monitoring described target BS.
19. subscriber equipment as claimed in claim 16, wherein, described acquisition module obtains described ascending resource assignment information by send dispatch request to described target BS.
20. subscriber equipment as claimed in claim 16, wherein, described acquisition module obtains the time of uplink first by switching command, and the described time of uplink is first determined by the described target BS timing advance TA value that transmission is calculated based on ascending multi-point collaboration.
21. subscriber equipment as claimed in claim 20, wherein, described TA value is absolute value or relative value.
22. subscriber equipment as claimed in claim 21, wherein, when described TA value is absolute value, the described time of uplink is first determined by described TA value.
23. subscriber equipment as claimed in claim 21, wherein, when described TA value is relative value, the described time of uplink was first determined by described TA value and current uplink time.
24. subscriber equipment as claimed in claim 16, wherein, if current TA value meets the demands, the described time of uplink is first determined by current TA value.
25. subscriber equipment as claimed in claim 15, wherein, described judge module judges whether to need random access further to comprise: if the switching command received comprises RACH, omit indication and/or TA value, perhaps described target BS is included in current ascending multi-point collaboration group of base stations, and described subscriber equipment judgement does not need described random access.
26. a base station comprises:
Judge module, during from source base station, being switched to the handover procedure of target BS, judge whether subscriber equipment needs to carry out random access procedure;
Sending module, in the situation that do not need to carry out random access procedure, send uplink transmission information; And
Wherein, described uplink transmission information is for carrying out the uplink first between described subscriber equipment and described target BS.
27. base station as claimed in claim 26, wherein, described uplink transmission information comprises: ascending resource assignment information and the time of uplink first.
28. base station as claimed in claim 27, wherein, send described ascending resource assignment information by switching command or PDCCH to described subscriber equipment.
29. base station as claimed in claim 27, wherein, when ascending multi-point collaboration transmits also when carrying out, timing advance TA value is calculated based on described ascending multi-point collaboration transmission in described base station, described TA value is included in switching command and sends to described subscriber equipment, with for determining the described time of uplink first.
30. base station as claimed in claim 29, wherein, described TA value is absolute value or relative value.
31. base station as claimed in claim 12, wherein, if the judgement of described judge module does not need random access, described base station is included in switching command RACH omission indication and/or TA value to notify described subscriber equipment.
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