CN1969583A - A method of scheduling a mobile terminal in soft handover - Google Patents
A method of scheduling a mobile terminal in soft handover Download PDFInfo
- Publication number
- CN1969583A CN1969583A CNA2005800197771A CN200580019777A CN1969583A CN 1969583 A CN1969583 A CN 1969583A CN A2005800197771 A CNA2005800197771 A CN A2005800197771A CN 200580019777 A CN200580019777 A CN 200580019777A CN 1969583 A CN1969583 A CN 1969583A
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- scheduling
- base station
- portable terminal
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims description 16
- 230000011664 signaling Effects 0.000 claims description 14
- 230000002708 enhancing effect Effects 0.000 claims description 4
- 238000005457 optimization Methods 0.000 claims description 3
- 238000010295 mobile communication Methods 0.000 claims 1
- 108700026140 MAC combination Proteins 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A method of scheduling enhanced dedicated channel transmissions from a mobile terminal (1) in soft handover comprises determining a sub-set (2,3,5) of base stations within an active set (2 to 6) which comply with specified criteria. Base stations (4, 6) outside the sub-set are caused to cease sending scheduling information in downlink (8) to the mobile terminal.
Description
The present invention relates in soft handover, carry out the method for scheduling (scheduling), particularly relate to the third generation mobile system for portable terminal.
Third generation affiliate (3GPP) universal mobile telecommunications system (UMTS) cellular radio system has the performance of the up-link (E-DCH is also referred to as HSUPA) of usually said enhancing.This performance makes portable terminal or subscriber equipment (UE) under the scheduling control of Node B, may be with very high speed, to base station or Node B transmission data.UE can adopt E-DCH to carry out transmitting speed, by one or more Node B, and according to the described information of data volume that stores with UE, or its needed data rate of UE indication, control.Node B points out to UE, in certain period, and the peak data rate that UE is allowed to use, perhaps transmission power level.
In 3GPP UMTS, UE can operate under a kind of state that is called as soft handover.In this case, UE utilizes dedicated channel, promptly exclusively is assigned to the physical channel of this UE, communicates by a more than Node B.If UE just operates under soft changing state, simultaneously also using E-DCH, then E-DCH can with thereby in radio network controller (RNC) synthetic data flow received by some or all Node B together.This in fact causes the data error rate of collective data stream lower, makes for given UE through-put power, compares with the situation of not operating under SHO, can adopt higher data rate on E-CDH.Some or all Node B that has started can be instructed to the arrangement of UE transmission timing.These instructions can comprise resource limit or " lifting/lowering " indication.In general, UE must obey the minimum instantaneous data rates that Node B provides, or indication " decline ".But if each Node B is all arranged the sequential of UE, then efficient is very low; And this sometimes scheduling need high-power, and if the path loss between UE and some Node B big, then may produce error.
According to the present invention, in soft handover, the method of carrying out scheduling for the transmission of the enhancing dedicated channel of portable terminal, be included in the subset of base stations of determining standard up to specification in the active set, and make base station outside the subclass in leading to the down link of portable terminal, stop to send information about scheduling.
The invention provides a kind of method, select all base stations in active set one group can scheduling the base station, by selecting, remove easier paired base station of making mistakes, therefore can save required power in those base stations, and between portable terminal and those selected base stations, improve the probability that successfully sends signaling.
The content of subclass is preferably upgraded with the variation of radio condition, thereby changes the grade of a concrete base station.
Specified standard preferably comprises the lower end limit of downlink loss, or has the some of the base station of lowest path loss in the active set.
When subclass comprised an independent base station, this method preferably further correspondingly comprises carried out optimization to the portable terminal dispatching algorithm in this base station.
The measurement that portable terminal carried out can be used for determining which base station is included in the subclass of portable terminal transmission timing arrangement information, portable terminal is pointed out to each base station, perhaps this base station has been selected into subclass, perhaps points out not answer the transmission timing arrangement information to unelected base station.
On the other hand, determining of subset of base stations according to the measurement report of portable terminal, carried out in UMTS grounding wireless access network road.
It is in the UE combination of resource allocation which Node B should be included in UE, be distinguished by one or more network element, for example radio network controller (RNC) or Node B.
Actually by portable terminal, Hai Shi by RNC, the decision of which or which base station of making one's options is flexibly to this present invention.It is contemplated that for the up link that strengthens, portable terminal will point out to carry out the preferred Node B of scheduling.
Subclass holder's signaling is added to the MAC head of each E-DCH transmission block preferably by the Node B identifier.
Be used to assess the measurement signaling of whether portable terminal being carried out scheduling, preferably be added to the MAC head of each the E-DCH transmission block that is sent to Node B.
On the other hand, whether be used to assess to portable terminal carry out scheduling the measurement signaling, also can control (RRC) by radio resource, send signaling to the UTRAN network.
Referring now to accompanying drawing, the present invention is described the example that portable terminal carries out scheduling in soft handover, wherein:
Fig. 1 is the structure chart that illustrates an embodiment of the inventive method.
Fig. 2 a and 2b illustrate, and use method of the present invention, how to make Node B be announced to include in a subclass of active set.
Fig. 1 illustrates first example of the present invention.A portable terminal 1 is used in the soft handover (SHO).The active set that is included in the base station 2,3,4,5,6 within the soft handover be presented at this portable terminal around.The present invention allows portable terminal 1 to point out one or more preferred base stations, carries out scheduling, and does not receive the scheduling instruction from all base stations in the active set.In UMTS, portable terminal is a UE, and the base station is a Node B, and these terms will be used for describing this
Embodiment.
When may receiving from the scheduling of all Node B in its active set, UE instructs, and UE is may be required to obey scheduler provides minimum instantaneous data rates the time, if in active set, have only the subclass of a Node B to arrange the program of UE, be good.Enhancing dedicated channel among the UMTS allows UE to point out to be used for the preferred Node B of scheduling, and therefore, UE must determine which Node B in the active set is to its E-DCH transmission carrying out scheduling.If UE1 has high path loss to some Node B 4,6, then may not receive the information of scheduling, maybe may receive wrong information.In any case if another Node B can more effectively be sent signaling with less power, then signaling sends a large amount of power wastes that need Node B.During soft handover, UE preferably carries out scheduling with the Node B with minimal path loss.This Node B also needs minimum power.If two or more Node B have similar power requirement, for example within 3dB, then UE can carry out scheduling by all these Node B, can adapt to littler configuration.
In addition, the possibility of the big path loss of up link is also increasing, and in the case, E-DCH helps little to the raising of overall performance, and with compare with stronger being connected of other Node B 2,3,5, noise improves lessly.Under this environment,, perhaps better if UE does not carry out scheduling by the site 4,6 with the most weak connection.After the Node B subclass of having selected expection, UE continues to send ul transmissions 7 to all Node B, but only to selected Node B 2,3,5 allocation of downlink capacity 8.Node B 4,6 is repelled outside the subclass of scheduling by UE1, just not to UE allocation of downlink capacity, and other UE that downlink capacity can be used for and this Node B communicates, its path loss is not so remarkable.
Therefore, the transmission of UE shows as expending of noise, but not the expending of the capacity of being arranged, so overall system capacity can increase.As mentioned above, the site 4,6 that does not participate in scheduling still is the part of active set, and therefore in the E-DCH transmission of uplink channel 7 receptions from UE, and participate in the SHO connection.Result as selection course, if have only a Node B UE is carried out scheduling, then the scheduling algorithm of Node B can optimization, know that according to Node B UE will necessarily defer to its scheduling instruction, and can not know to make capacity allocation under capacity is whether with situation about using, otherwise will be more conservative.
In the present invention, according to the path loss measurement result that UE did, UE 1 points out its preferred scheduling Node B 2,3,5.The path measurements that UE did can be to receive signaling code power (RSCP) mensuration according to the common pilot indicating channel of having stipulated (CPICH) to carry out in UMTS.Then, this selection has been notified all Node B in the soft-handoff groups by up link 7.Carry out the subclass of the Node B of scheduling, for instance, can whether fall into network according to its down link footpath loss and within its limiting value of pointing out, select.On the other hand, also can be selected when n unit has lowest path loss, perhaps, also these two kinds of methods can be combined and select.
The subclass of selected Node B is all interior Node B of informing movement collection frequently, make it to adapt to the variation of radio environment.The method of notice selected node B is to include its identifier in medium access control (MAC) head, medium access control (MAC) head is included in each E-DCH transmission block, the i.e. data block that in an E-DCH TTI, transmits, wherein Transmission Time Interval (TTI) expression forward error correction (FBC) coding stagger(ed) cycle.This point illustrates in Fig. 2.Fig. 2 a illustrates MAC protocol data unit (PDU), expression PDU, MAC-d head and comprise multiplexing, and the MAC-e head of sequential arrangement information, and the indication of carrying out the Node B of scheduling.Fig. 2 b represents MAC PDU, expression PDU, MAC-d head and comprise multiplexing, and the MAC-e head of sequential arrangement information, and from the indication of down link (DL) path loss of each B.A kind of substitute mode sends for adopting physical layer signaling, although this is for UE, expense is higher aspect transmitting power; For network, expense is higher aspect jamming resource.
UE is as follows to the another kind of mode that the Node B that will carry out scheduling sends signaling, and directly the measurement result that portable terminal is reported sends to each base station, then by the base station according to limiting value, whether decision carries out scheduling to portable terminal.For example, directly the RSCP measurement result that UE reported is sent to Node B, whether it should arrange UE is carried out the E-DCH transmission by the Node B decision then.Node B can decide whether it should be the UE scheduling in following period of time according to measuring whether point out that path loss has surpassed limiting value.
Another embodiment of the inventive method is to make UMTS Radio Access Network (UTRAN), according to the CPICH RSCP measurement result that UE provides, selects to carry out the best-of-breed element of scheduling, rather than allows UE or Node B directly make decision.According to description to existing standard, can order UE to send CPICH RSCP measurement report to UTRAN, can in the UTRAN network, select the optimal node B that carries out scheduling according to measurement report.But these measurements are that the RNC (SRNC) that works to the core network of the UE that is through with, Iu, connection makes, rather than make for one or more control RNC (CRNC) of Control Node B.SRNC points out preferred Node B to CRNC, by CRNC this situation is informed Node B again.This selection can not be made faster reaction to the variation of radio path, by contrast, measures according to UE at UE, and reaction is then very fast during selected its best scheduling Node B.
Under the situation when UE clearly selectes its optimal node B, Node B may be received the signaling from UE, point out according to a hierarchal order, whether this Node B is one that arranges among the optimal node B of UE program, rather than point out a certain concrete Node B, whether should be as the part of a continuous scheduling process, in the concrete time of at every turn causing, be a certain concrete UE scheduling owing to traffic or radio situation.
Claims (9)
1, in soft handover, for a kind of method of carrying out scheduling from the transmission of the enhancing dedicated channel (E-DCH) of portable terminal, this method is included in the subset of base stations of determining a standard up to specification in the active set, and make base station outside the subclass in leading to the down link of portable terminal, stop to send information about scheduling.
2, the method in the claim 1, wherein the content of subclass is upgraded with the variation of radio condition, thereby changes the grade of a concrete base station.
3, the method in claim 1 or the claim 2, wherein specified standard comprises the lower end limit of down link footpath loss, perhaps comprises the some of the base station that has lowest path loss in the active set.
4, the method in aforementioned any one claim, wherein when subclass comprised an independent base station, this method also further comprises carried out optimization to the portable terminal scheduling algorithm in this base station.
5, the method in aforementioned any one claim, wherein be used for determining that by the measurement result that portable terminal carried out which base station is included in the subclass of this terminal transmission timing arrangement information, and portable terminal is pointed out to each base station, perhaps this base station has been selected into subclass, perhaps points out should not send information about scheduling to unelected base station.
6, the method for any one in the claim 1～4, wherein determining of subset of base stations is the measurement report according to portable terminal, carries out in global system for mobile communications (UMTS) grounding wireless access network network (UTRAN).
7, the method in aforementioned any one claim, wherein subclass holder's signaling is added to the media access control MAC head of each E-DCH transmission block by means of the Node B identifier.
8, the method in aforementioned any one claim wherein is used to assess the measurement signaling of whether portable terminal being carried out scheduling, is added to the MAC head of each the E-DCH transmission block that sends Node B to.
9, the method for any one in the claim 1～7 wherein is used to assess the measurement signaling of whether portable terminal being carried out scheduling, by radio resource control (RRC), sends to the UTRAN network.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0413585.1 | 2004-06-17 | ||
| GBGB0413585.1A GB0413585D0 (en) | 2004-06-17 | 2004-06-17 | Scheduling method |
| GB0425352.2 | 2004-11-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1969583A true CN1969583A (en) | 2007-05-23 |
Family
ID=32750102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800197771A Pending CN1969583A (en) | 2004-06-17 | 2005-06-13 | A method of scheduling a mobile terminal in soft handover |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1969583A (en) |
| GB (2) | GB0413585D0 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8107885B2 (en) * | 2002-10-30 | 2012-01-31 | Motorola Mobility, Inc. | Method and apparatus for providing a distributed architecture digital wireless communication system |
| US7602722B2 (en) * | 2002-12-04 | 2009-10-13 | Nortel Networks Limited | Mobile assisted fast scheduling for the reverse link |
| AU2004200541B2 (en) * | 2003-02-15 | 2006-06-01 | Samsung Electronics Co., Ltd. | Scheduling apparatus and method in a CDMA mobile communication system |
| WO2005018114A1 (en) * | 2003-08-19 | 2005-02-24 | Lg Electronics Inc. | Node b scheduling method for mobile communication system |
-
2004
- 2004-06-17 GB GBGB0413585.1A patent/GB0413585D0/en not_active Ceased
- 2004-11-05 GB GB0425352A patent/GB2415331A/en not_active Withdrawn
-
2005
- 2005-06-13 CN CNA2005800197771A patent/CN1969583A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB0425352D0 (en) | 2004-12-22 |
| GB0413585D0 (en) | 2004-07-21 |
| GB2415331A (en) | 2005-12-21 |
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Owner name: NOKIA SIEMENS COMMUNICATION CO., LTD. Free format text: FORMER OWNER: SIEMENS AG Effective date: 20080118 |
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