CN101351996A - Methods and apparatus for selecting and signaling a preferred link among a plurality of maintained wireless communications links - Google Patents
Methods and apparatus for selecting and signaling a preferred link among a plurality of maintained wireless communications links Download PDFInfo
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- CN101351996A CN101351996A CNA2006800455320A CN200680045532A CN101351996A CN 101351996 A CN101351996 A CN 101351996A CN A2006800455320 A CNA2006800455320 A CN A2006800455320A CN 200680045532 A CN200680045532 A CN 200680045532A CN 101351996 A CN101351996 A CN 101351996A
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Abstract
Methods and apparatus for maintaining, selecting and indicating a preferred communications link with an access node, e.g., base station, are described.
Description
Related application
The application's case advocate being entitled as of application on October 13rd, 2005 " being used for selecting and the method and apparatus of signaling-preferred link " at a plurality of wireless communication links of keeping the 60/726th, the priority of No. 588 U.S. Provisional Patent Application cases, described application case are incorporated this paper clearly by reference into.
Technical field
The present invention relates to wireless communication system, and more particularly, the present invention relates to be used to operate and use the method and apparatus that to keep with the wireless terminal of the communication link of a plurality of tie points.
Background technology
Wireless terminal has better and/or more about the current information of the quality of down link than the information that can be used for network element usually.For instance, the core parts that are coupled to a plurality of base stations can have the out-of-date a little information about the quality of particular link, and described particular link is corresponding to the different base station that can be connected with wireless terminal.In addition, core network element may not known the current business loading condition at place, base station.
Some wireless terminals have the ability of supporting a plurality of wireless communication links simultaneously.Different links can have different tie points (for example, base station or sector).Because different links can be corresponding to different physical point of attachments or different frequency bands, so the signal conditioning on the different links of keeping at the same time can change.For being professional purpose of carrying out Path selection, may use link at particular point in time with preferred channel condition.Yet, decide on the business load in the sub-district, in the delay aspect the traffic segment (traffic segment) that obtains to be assigned or other conditions one link is had than at the particular point in time lower channel quality of another link more preferably.
Should use which link if wireless terminal can be used to be chosen in particular point in time to the understanding of link-quality, be desirable so.If allow the base station in the flexibility of selecting aspect particular point in time uses which link in a plurality of links, to have to a certain degree, so that the known information in base station can be used for determining using which link that information is propagated into wireless terminal, so also be desirable.
In view of above argumentation, which should be appreciated that: need to allow wireless terminal to influence link in a plurality of communication links and will be used for sending to the method for wireless terminal at the special time down link signal (for example, for example the user data of text, audio frequency and/or view data etc.) of naming a person for a particular job.
Summary of the invention
Below describe and be used to keep, select and the method and apparatus of the preferred communications link of indication and access node (for example, base station).
According to an one exemplary embodiment of the present invention, a wireless terminal is kept the communication link with a plurality of different tie points simultaneously.Described wireless terminal carries out one or more signal measurements to the signal that receives via different links.Then, wireless terminal is selected a preferred downlink wireless communication link from keep communication link.Wireless terminal signals is connected with one or more in the tie point of communication link, and described communication link is chosen as preferred communications link at particular point in time by described tie point.Though preferred link indicator is propagated into a tie point, should be appreciated that: this signal indication link preference, for example, whether wireless terminal thinks that the down link corresponding to described tie point is a preferred link.Receive the base station and the indicated preferred link of nonessential use of preferred link indicator.For instance, in certain embodiments, the base station will consider preferred link indicator information and other information of traffic load conditions for example when determining whether to use particular downlink.Sometimes, can be to the down link signal of wireless terminal via the preferred link of WT appointment, and at other times, can be to the down link signal of wireless terminal via the link of not being appointed as preferred link as yet by WT.
The signal measurement that is used for the preferred link selection course that wireless terminal carries out can comprise signal strength measurement, signal to noise ratio (snr) measurement, signal interferometry etc.In some (but needn't for all) embodiment, limited preventing is disturbed or other temporary transient channel conditions and the rapid change of the link selection that causes or the variation of changing fast temporarily by (for example) to allowing wireless terminal to change speed that its preferred link selects.Also can change the speed that its preferred link selects and be limited, increase the reliability of base station the detection of the described signaling of being undertaken by wireless terminal with (for example) to wireless terminal.
The base station that receives preferred link information is selecting via which available downlink to connect to come for down link signal and business (for example, user data) to use preferred link to indicate when carrying out Path selection.When being determined at particular point in time and using which link to be used for downlink traffic, except that preferred link information, other conditions that BTS service load and/or base station are known also can be considered in the base station.
Can be (for example according to predetermined scheduling, corresponding to the scheduling of dedicated uplink control channel time slot, described dedicated uplink control channel time slot can be used for the preferred link selected to one or more tie points report wireless terminal) carry out preferred link and select and reporting process.
Though the link that mobile node can (and certain in certain embodiments) be selected to have best link quality is as preferred link, wireless terminal also can be taken the additional chain circuit choice criteria beyond the link-quality into account when selecting preferred link.For instance, when selecting preferred link, also can consider link stand-by period, link load and/or other factors that are associated with communication link.
Though in above [summary of the invention], discussed a plurality of embodiment, should be appreciated that: needn't all comprise same characteristic features by all embodiment, and in the above feature some and nonessential, but may be desirable in certain embodiments.In execution mode subsequently, discuss many additional features of the present invention, benefit and embodiment.
Description of drawings
Fig. 1 is for according to the present invention and use the figure of the example communications system that method of the present invention implements.
Fig. 2 is the figure of explanation according to exemplary signaling of the present invention and link selection.
Fig. 3 is the figure of indication according to one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the variation of preferred link.
Fig. 4 is the figure of indication according to another one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the variation of preferred link.
Fig. 5 is the flow chart of the exemplary method of operations according to the instant invention wireless terminal.
Fig. 6 is the figure of indication according to one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the variation of preferred link.
Fig. 7 is the figure of indication according to another one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the variation of preferred link.
Fig. 8 is the figure of indication according to one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the variation of preferred link.
Fig. 9 comprise explanation according to the present invention by the figure of wireless terminal in order to the example of the filtering signal ionization meter of determining preferred downlink.
Figure 10 is the figure of indication according to another one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the variation of preferred link.
Figure 11 is for according to the present invention and use the figure of the exemplary wireless terminal (for example, mobile node) that method of the present invention implements.
Figure 12 is for according to the present invention and use the figure of the exemplary base station (for example, access node) that method of the present invention implements.
Embodiment
Fig. 1 is for according to the present invention and use the figure of the example communications system 100 that method of the present invention implements.Example communications system 100 can be (for example) Orthodoxy Frequency Division Multiplex (OFDM) spread spectrum multiple access wireless communication system.Example communications system 100 comprises a plurality of sub-districts (sub-district 1 102, sub-district M 104), and each sub-district (102,104) represent the wireless coverage area of corresponding base station (BS 1 106, BS M 108) respectively.Each base station is the fan zoning base station of the different tie points of each sector of support.Sub-district 1 102 comprises sector A 110, sector B 112 and sector C 114; Sub-district M 104 comprises sector A116, sector B 118 and sector C 120.Network node 122 (for example, router) is coupled to via network link (124,126) respectively in base station (106,108).Network node 122 is coupled to other network node/internets via network link 125.Network link (124,126,125) can be (for example) optical fiber link.
Fig. 2 is explanation Figure 200 according to exemplary signaling of the present invention and link selection.Exemplary WT A 206 is shown as has two Radio Links of having set up, and WTA 206 is coupled to base station tie point A 202 to first link 208 and second link 210 is coupled to base station tie point B 204 with WTA206.Described two base station tie point A and B can be co-located in same place, and for example, different sectors are corresponding to same base, or different carrier frequencies or tone blocks are corresponding to same base station sector.Perhaps, two base station tie point A and B (202,204) can not be co-located in same place, for example, and corresponding to the different adjacent base stations that are arranged in neighbor cell.
Each base station tie point (A 202, B 204) is transmitted downlink signal (212,214) respectively.Down link signal can be including (for example) beacon signal, pilot signal, appointment signal, paging signal, control signal, user data signal.In institute's transmitted downlink signal (212,214) at least some are received by WTA206 and are treated, for example, determine in received signal intensity (for example the pilot signal strength that receives or the beacon signal intensity that receives), signal to noise ratio (snr), signal-to-jamming ratio (SIR), sector load and the type of service (for example sound or data) corresponding to each group signal (212,214) at least one.In certain embodiments, receive and handle down link signal from other base station tie points, for example from the extra beacon signal of a base station tie point, described extra beacon signal is current not to be associated with the link of having set up but to be used to produce beacon than report or definite SNR or SIR.
In step 216, the WT A 206 that has received and handled down link signal (212,214) selects a preferred link to use, and via described preferred link the downlink user data signal is propagated into WT.According to the present invention, described preferred link select to depend on following at least one: SNR, SIR, received signal intensity, beacon intensity, sector load and type of service.In certain embodiments, described selection is based on now and the past condition.Arrow 218 indication WTA206 in Dedicated Control Channel (for example, by the timing of BS tie point A use and the dedicated uplink tone of frequency structure, it is assigned to WT A 206 by BS tie point A) go up its preferred link signaling in base station tie point A 202.In certain embodiments, wireless terminal can be operated with the different mode of Dedicated Control Channel operation at different time, and for example, wherein wireless terminal is assigned the full DCCH pattern that has for its special-purpose uplink logical tone; And wherein wireless terminal and other wireless tones are shared the 1/3DCCH operator scheme of a uplink logical tone of being assigned.In certain embodiments, the speed of preferred link signaling is the function of wireless terminal operator scheme.According to each embodiment of the present invention, the indication of WT preferred link is and the common coding of channel condition report (for example, SNR report, the report of beacon ratio etc.).According to some embodiments of the present invention, on Dedicated Control Channel, periodically carry out signaling.Arrow 220 indication WT A 206 in Dedicated Control Channel (for example, by the timing of BS tie point B use and the dedicated uplink tone in the frequency structure, it is assigned to WT A 206 by BS tie point B) go up its preferred link signaling in base station network tie point B 202.
In dotted arrow 226 and the 228 indication base station tie points (202,204) one or more are transferred to WTA206 (for example, determining according to step 222 and 224) with downlink user data.Two base station tie points (202,204) are transferred to downlink user data WTA 206 simultaneously, and simultaneously WTA 206 only has at any given time that a preferred link is possible.
Fig. 3 is indication Figure 30 0 according to one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the variation of preferred link.In certain embodiments, need mobile node keeping preferred link in N continuous slot at least, wherein N is the positive integer greater than 1.For instance, in the one exemplary embodiment of Fig. 3, N=3.Figure 30 0 comprises the trunnion axis 302 of express time.Show 11 continuous exemplary time slots (time slot 1 304, time slot 2 306, time slot 3 308, time slot 4 310, time slot 5 312, time slot 6 314, time slot 7 316, time slot 8 318, time slot 9 320, time slot 10 322, time slot 11 324) among the figure.The boundary of step 326 indication mobile node between time slot 1 and time slot 2 changes preferred link.Step 328 indication MN is limited in the interior preferred link that changes of duration (time slot 2 is to time slot 4) of 3 time slots.The boundary of step 330 indication between time slot 4 and time slot 5, MN changes preferred link once more.Step 332 indication MN is limited in the interior preferred link that changes of duration (time slot 5 is to time slot 7) of 3 time slots.The boundary of step 334 indication MN between time slot 8 and time slot 9 changes preferred link (for example, expiring because satisfied switching standards and switched restriction).Attention: if satisfied switching standards, mobile node can begin to change preferred link at the boundary between block 7 and the block 8 so.Step 336 indication MN is limited in the interior preferred link that changes of duration of 3 time slots, and wherein said being limited in when time slot 11 finishes is disengaged.
Fig. 4 is indication Figure 40 0 according to one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the variation of preferred link.In certain embodiments, need mobile node to keep preferred link in the channel reporting that N is organized continuously at least, wherein N is the positive integer greater than 1.For instance, in the one exemplary embodiment of Fig. 4, N=2.Figure 40 0 comprises the trunnion axis 402 of express time.Channel reporting (the first channel reporting A404 that has showed 8 continuous exemplary set among the figure, the first channel reporting B 406), (second channel report A 408, second channel report B 410), (the 3rd channel reporting A 412, the 3rd channel reporting B 414), (the 4th channel reporting A 416, the 4th channel reporting B 418), (the 5th channel reporting A420, the 5th channel reporting B 422), (the 6th channel reporting A424, the 6th channel reporting B 426), (the 7th channel reporting A 428, the 7th channel reporting B 430), (the 8th channel reporting A 432, the 8th channel reporting B 434).Step 426 indication mobile node changes preferred link in the time corresponding to first group of channel reporting (404/406).Step 438 indication MN is limited in the interior preferred link that changes of duration of 2 channel report intervals.Step 440 indication is in the time corresponding to the 3rd group of channel reporting (412/414), and MN changes preferred link once more.Step 442 indication MN is limited in the interior preferred link that changes of duration of 2 channel report intervals.Step 444 indication changes preferred link (for example, expiring because satisfied switching standards and switched restriction) at the time MN corresponding to the 6th group of channel reporting (424/426).Attention: in case the restriction expiration, MN just can (but and nonessential) change preferred link.For instance, because satisfied switching standards, so mobile node can begin to change preferred link in the time corresponding to the 5th group of channel reporting, but MN determines not with its change.Step 446 indication MN is limited in the interior preferred link that changes of duration of 2 channel report intervals.
Fig. 5 is the flow chart 500 of the exemplary method of operations according to the instant invention wireless terminal.Operation starts from step 502, wherein wireless terminal before be powered and initialization, to two base station tie points registrations, and set up two Radio Links, one in the described link is appointed as preferred link and another link is appointed as alternate link.Operation proceeds to step 504 from step 502.
In step 504, the operate wireless terminating machine is to receive from each down link signal in a plurality of base station section tie points.Operation proceeds to step 506 from step 504, wherein the operate wireless terminating machine with calculate from be received from corresponding to each sector tie point of current alternate link and corresponding to institute's received power of the signal of the sector tie point of current preferred link through the filtering pattern.Operation proceeds to step 508 from step 506.
In step 508, wireless terminal test replacement link through the filtering received power whether exceed preferred link through the filtering received power first value X (for example, 0 or 0.5dB).If the exceeding current preferred link through the filtering received power and be worth X at least of alternate link, operation proceeding to step 509 so; Otherwise step 504 is returned in operation.
In step 509, whether the wireless terminal machine check satisfies the hysterisis criterion of switching from current preferred link.For instance, allowing before wireless terminal changes into alternate link with the preferred link indicator value of signaling, described wireless terminal may be in N1 continuous time interval at least with same preferred link road indicator value signaling in current preferred link.If satisfy hysterisis criterion, operation proceeds to step 510 so; Otherwise step 504 is returned in operation.
In step 510, the operate wireless terminating machine with: (i) the previous alternate link that will exceed threshold value in step 508 is changed into new preferred link and (ii) previous preferred link is changed into new alternate link.Step 510 comprises substep 512.In substep 512, the operate wireless terminating machine is to regulate the institute's received power filtering on the link, and the second value Y (for example, 3dB) so that new preferred received power raises.In certain embodiments, this extra initial gain that can be decay in time that raises of new preferred received power filtering increases.According to the present invention, selective value X and Y are to provide hysteresis.
In certain embodiments, as the possible alternative that changes filtering parameter owing to the decision-making of switching preferred link, according to the time adjusting switching standards of lighting from last conversion.For instance, can switch the difference that switching standards afterwards is set at 3dB with following closely, and the described switching standards of may command is so that it decays to lower limit 0.5dB or 0dB in time.
Fig. 6 is the picture group of indication according to one exemplary embodiment of the present invention, wherein has hysteresis to a certain degree in the change of preferred link.In certain embodiments, before allowing another preferred link of mobile node signaling, its may be in N continuous signaling chance the signaling preferred link, wherein N is the positive integer greater than 1.For instance, in the one exemplary embodiment of Fig. 6, N=4.Figure 60 2 comprises the trunnion axis 601 of 603 pairs of express times of vertical axis of expression tie point A Dedicated Control Channel preferred link signaling chance.Figure 60 2 explanations are with 17 continuous signaling chances of preferred link indicator signaling tie point A.Figure 60 4 comprises the trunnion axis 601 of 605 pairs of express times of vertical axis of expression tie point B Dedicated Control Channel preferred link signaling chance.Figure 60 4 explanations are with 17 continuous signaling chances of preferred link indicator signaling tie point A.
Figure 60 6 comprises the vertical axis 607 of expression tie point A Dedicated Control Channel preferred link signal indicator, to the trunnion axis 601 of express time.Each indicator value of Figure 60 6 is corresponding to the signaling chance of Figure 60 2.The pattern (0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1) of Figure 60 6 indication indicator signal, wherein indicator value=1 indication is the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point A, and indicator value=0 indication is not the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point A simultaneously.Attention: according to employed standard in this one exemplary embodiment that the continuous signaling of same preferred link line signaling indicator value (4,5,4) is inferior, the continuous signaling of each exemplary set uses at least four continuous signaling chances.
Figure 60 8 comprises the vertical axis 609 of expression tie point B Dedicated Control Channel preferred link signal indicator, to the trunnion axis 601 of express time.Each indicator value of Figure 60 8 is corresponding to the signaling chance of Figure 60 4.The pattern (1,1,1,1,0,0,0,0,1,1,1,1,1,0,0,0,0) of Figure 60 8 indication indicator signal, wherein indicator value=1 indication is the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point B, and indicator value=0 indication is not the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point B simultaneously.Attention: according to employed standard in this one exemplary embodiment that the continuous signaling of same preferred link line signaling indicator value (4,5,4) is inferior, the continuous signaling of each exemplary set uses at least four continuous signaling chances.
In certain embodiments, but there is not preferred link in the mobile device signaling at preset time point.In certain embodiments, mobile device also can be indicated a plurality of preferred link at some preset time.
Fig. 7 is the picture group of indication according to one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the change of preferred link.In the one exemplary embodiment of Fig. 7, mobile node is operated with full Dedicated Control Channel operator scheme with respect to tie point A and is operated with 1/3 Dedicated Control Channel operator scheme with respect to tie point B, and each pattern is all supported with respect to propagating the different uplink signalling speed that preferred link is used for the downlink user data signaling.According to a plurality of embodiment of the present invention, under the condition of mixed mode operations, before the permission mobile node is changed into the preferred link indicator value of signaling corresponding to the tie point that uses the up link Dedicated Control Channel of hanging down signaling rate, mobile node is signaling same preferred link road indicator value in N continuous time interval at least, and wherein N is the positive integer greater than 1.In certain embodiments, the signaling that uses higher uplink signalling speed to another tie point is set at meets the information of propagating via low signaling rate channel.
For instance, in the one exemplary embodiment of Fig. 7, N=3.Figure 70 2 comprises the vertical axis 703 of expression with the tie point A Dedicated Control Channel preferred link signaling chance of full DCCH pattern operation, to the trunnion axis 701 of express time.Figure 70 2 explanations are with 33 continuous signaling chances of preferred link indicator signaling tie point A.Figure 70 4 comprises the vertical axis 705 of expression with the tie point B Dedicated Control Channel preferred link signaling chance of 1/3 DCCH pattern operation, to the trunnion axis 701 of express time.Figure 70 4 explanations are with 11 continuous signaling chances of preferred link indicator signaling tie point B.
Figure 70 6 comprises the vertical axis 707 of expression tie point A Dedicated Control Channel preferred link signal indicator, to the trunnion axis 701 of express time.Each indicator value of Figure 70 6 is corresponding to the signaling chance of Figure 70 2.The pattern (1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0) of Figure 70 6 indication indicator signal, wherein indicator value=1 indication is the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point A, and indicator value=0 indication is not the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point A simultaneously.
Figure 70 8 comprises the vertical axis 709 of expression tie point B Dedicated Control Channel preferred link signal indicator, to the trunnion axis 701 of express time.Each indicator value of Figure 70 8 is corresponding to the signaling chance of Figure 70 4.The pattern (0,0,0,1,1,1,0,0,0,1,1) of Figure 70 8 indication indicator signal, wherein indicator value=1 indication is the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point B, and indicator value=0 indication is not the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point B simultaneously.Attention: according to employed standard in this one exemplary embodiment, before same preferred link line signaling indicator value is changed into another indicator value with its continuous signaling at least three times.Notice that the designator pattern of Figure 70 6 has been set to realize the consistency of two preferred link assignment between the tie point.
Fig. 8 is the picture group of indication according to one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the change of preferred link.In the one exemplary embodiment of Fig. 8, mobile node operate with full Dedicated Control Channel operator scheme with respect to tie point A and with respect to tie point B with 1/3 Dedicated Control Channel operation mode, each pattern is all supported with respect to propagating the different uplink signalling speed that preferred link is used for the downlink user data signaling.According to a plurality of embodiment of the present invention, under the condition of mixed mode operations, before the permission mobile node is changed into the preferred link indicator value of signaling corresponding to the tie point that uses the up link Dedicated Control Channel of hanging down signaling rate, described mobile node is signaling same preferred link road indicator value in N1 continuous time interval at least, wherein N1 is the positive integer greater than 1, and before the permission mobile node is changed into the preferred link indicator value of signaling corresponding to the up link Dedicated Control Channel of using higher signaling rate, described mobile node is signaling same preferred link road indicator value in N2 continuous time interval at least, and wherein N2 is the positive integer greater than 1.At some among this kind embodiment, N1=N2.For instance, in the one exemplary embodiment of Fig. 8, N1=N2=4.
In certain embodiments, the value of N1 or N2 depends on the pattern with tie point A and B associated uplink Dedicated Control Channel, and it is predetermined.In another embodiment, the value of N1 or N2 can be configured and as the function of the business of MN and change.
Figure 80 2 comprises the vertical axis 803 of expression with the tie point A Dedicated Control Channel preferred link signaling chance of full DCCH pattern operation, to the trunnion axis 801 of express time.Figure 80 2 explanations are with 33 continuous signaling chances of preferred link indicator signaling tie point A.Figure 80 4 comprises the vertical axis 805 of expression with the tie point B Dedicated Control Channel preferred link signaling chance of 1/3DCCH pattern operation, to the trunnion axis 801 of express time.Figure 80 4 explanations are with 11 continuous signaling chances of preferred link indicator signaling tie point B.
Figure 80 6 comprises the vertical axis 807 of expression tie point A Dedicated Control Channel preferred link signal indicator, to the trunnion axis 801 of express time.Each indicator value of Figure 80 6 is corresponding to the signaling chance of Figure 80 2.The pattern (1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1) of Figure 80 6 indication indicator signal, wherein indicator value=1 indication is the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point A, and indicator value=0 indication is not the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point A simultaneously.
Figure 80 8 comprises the trunnion axis 801 of 809 pairs of express times of vertical axis of expression tie point B Dedicated Control Channel preferred link signal indicator.Each indicator value of Figure 80 8 is corresponding to the signaling chance of Figure 80 4.The pattern (0,0,0,0,1,1,1,1,0,0,0) of Figure 80 8 indication indicator signal, wherein indicator value=1 indication is the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point B, and indicator value=0 indication is not the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point B simultaneously.
Attention:, change in same preferred link line signaling indicator value before another indicator value that is used for given tie point with its continuous signaling at least four times according to employed standard in this one exemplary embodiment.In this one exemplary embodiment, existing wherein two different tie points may have separately about which link is the certain situation of the different understanding of preferred link.
Fig. 9 comprise according to the present invention explanation by wireless terminal in order to determine the figure through the example of filtering signal ionization meter of preferred downlink.Figure 90 2 is for being coupled to exemplary wireless terminal in the chart of two exemplary established links of two tie points, and wherein the received signal ionization meter is on vertical axis 904, and the time is on trunnion axis 906.By the indication of the indicated point of the symbol O on Figure 90 2 from the pilot signal of tie point O according to measured signal strength signal intensity of time.By the indication of the indicated point of the symbol X on Figure 90 2 from the pilot signal of tie point X according to measured signal strength signal intensity of time.Corresponding to Figure 90 7 of Figure 90 2 for exemplary wireless terminal being coupled to the chart of two exemplary established links of two network connection points, wherein through the received signal strength measurement of filtering on vertical axis 908, the time is on trunnion axis 906.Signal strength signal intensity by the indication of the indicated point of the symbol O on Figure 90 7 according to time institute's filtering from the pilot signal of tie point O.By the signal strength signal intensity according to time institute filtering of the indicated point of the symbol X on Figure 90 7 indication from the pilot signal of tie point X.Form 914 indication wireless terminals according to the preferred link of time and corresponding to Figure 90 7.
In this one exemplary embodiment, preferred link is switched the comparison of determining to be based on through filtered measurement signal intensity.For instance, when alternate link through filtering strength equal or exceed current preferred link through filtering strength the time, alternate link is set at new preferred link.Before the time 910, the O link through filtering signal intensity exceed the X link through filtering signal intensity, and link O still is a preferred link.When time point 910, equal or exceed signal strength signal intensity a little through filtering X signal strength signal intensity through filtering O, WT with its to selection of preferred link from O switch to X and change new preferred link filtering so that new preferred link through filter value rising 3dB (as indicated) by level deviation 912.Filter through design with this gain setting through adding for decaying in time.Yet the gain of this interpolation provides hysteresis in certain time interval at least after link switchover, has therefore prevented the bad reciprocal switching that takes place usually originally in borderline region.For instance, consider the time 912 after switching, Figure 90 4 indication O link received signals are higher than X link received signal a little, and this can cause switching back the O link in receive measurement when directly being used; Yet,, still exceed link signal through filtering X link signal, thereby prevented bad switching through filtering O 912 o'clock time.
Figure 10 is the picture group of indication according to one exemplary embodiment of the present invention, and wherein there is hysteresis to a certain degree in the change of preferred link.In Figure 100 2, mobile node is connected to tie point A and tie point B.When tie point A is preferred link, before the permission mobile node is changed into tie point B with preferred link, need described mobile node in N1 continuous time interval at least with same preferred link road indicator value signaling in tie point A, wherein N1 is the positive integer more than or equal to 1.When tie point B is preferred link, before the permission mobile node is changed into tie point A with the preferred link of signaling, need described mobile node signaling same preferred link road indicator value in N2 continuous time interval at least, wherein N2 is the positive integer more than or equal to 1.In some these type of embodiment, N1 is not equal to N2.For instance, in the one exemplary embodiment of Figure 10, N1=3 and N2=2.In addition, in some one exemplary embodiment, do not allow mobile node to indicate same preferred link road indicator value to tie point A and B in preset time.
Figure 100 2 comprises the vertical axis 1003 of expression tie point A Dedicated Control Channel preferred link signaling chance, to the trunnion axis 1001 of express time.Figure 100 2 explanations are with 17 continuous signaling chances of preferred link indicator signaling tie point A.Figure 100 4 comprises the vertical axis 1005 of expression tie point B Dedicated Control Channel preferred link signaling chance, to the trunnion axis 1001 of express time.Figure 100 4 explanations are with 17 continuous signaling chances of preferred link indicator signaling tie point B.
Figure 100 6 comprises the vertical axis 1007 of expression tie point A Dedicated Control Channel preferred link signal indicator, to the trunnion axis 1001 of express time.Each indicator value of Figure 100 6 is corresponding to the signaling chance of Figure 100 2.The pattern (1,1,1,0,0,1,1,1,1,0,0,1,1,1,0,0,0) of Figure 100 6 indication indicator signal, wherein indicator value=1 indication is the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point A, and indicator value=0 indication is not the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point A simultaneously.
Figure 100 8 comprises the vertical axis 1009 of expression tie point B Dedicated Control Channel preferred link signal indicator, to the trunnion axis 1001 of express time.Each indicator value of Figure 100 8 is corresponding to the signaling chance of Figure 100 4.The pattern (0,0,0,1,1,0,0,0,0,1,1,0,0,0,1,1,1) of Figure 100 8 indication indicator value, wherein indicator value=1 indication is the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point B, and indicator value=0 indication is not the preferred link that is used for the downlink user data signaling corresponding to the established link of tie point B simultaneously.
Attention: according to employed standard in this one exemplary embodiment, no matter when when tie point A is preferred link, before preference is changed into tie point B, mobile node all in N1=3 continuous time interval at least continuously with same preferred link line signaling indicator value signaling in tie point A.Please note in addition: according to employed standard in this one exemplary embodiment, no matter when when tie point B is preferred link, before preference is changed into tie point A, mobile node all in N2=2 continuous time interval at least with same preferred link line signaling indicator value signaling in tie point B.In addition, in this one exemplary embodiment, not existing wherein, two different tie points are the situation that preferred link has different understanding about which link.
The those skilled in the art can design many configurations, though it is not clearly showed in Figure 10 or describe, it has still embodied the principle that belongs in the scope of the present invention.For instance, though Figure 10 is under with respect to the situation of the mobile node of the identical Dedicated Control Channel operation mode with B of tie point A and describe, the situation that the present invention is applicable to also that mobile node is wherein operated with full dedicated channel operator scheme with respect to tie point A and operates with 1/3 Dedicated Control Channel operator scheme with respect to tie point B.In addition, in another embodiment, only may exist wherein however violate with the preferred link indicator value signaling in the hysterisis criterion of each tie point just allow mobile node with same preferred link road indicator value signaling in the situation of two tie points.
In certain embodiments, the mobile device switching machine that switches its preferred link can not use hysteresis.For instance, in some these type of embodiment, provide the chance of switching its preferred link corresponding to each channel reporting group for mobile device.In other these type of embodiment, for mobile device is provided at the scheduled time (for example to repeat timing architecture, switching machine meeting of every beacon slot, wherein beacon slot be fixed number (for example, 912) continuous OFDM symbol transmission time at interval) switch the chance of its preferred link.
Figure 11 is for according to the present invention and use the figure of the exemplary wireless terminal 1100 (for example, mobile node) that method of the present invention implements.Exemplary extended spectrum multiple access Orthodoxy Frequency Division Multiplex (OFDM) wireless communication system of wireless terminal 1100 (for example, mobile node) for implementing according to the present invention.Exemplary wireless terminal 1100 comprises receiver 1102, transmitter 1104, processor 1106, user I/O device 1108 and the memory 1110 that is coupled via bus 1112, wherein each element can be via described bus 1112 interchange of data and information.
Receiver 1102 (for example, OFDM receiver) is from least two network connection point received signals.Receiver 1102 comprises receiver chain 1 1114 and receiver chain 2 1116.Receiver chain 1 1114 is coupled to reception antenna 1115, receives the down link signal from the base station tie point via described reception antenna 1115.Receiver chain 2 1116 is coupled to reception antenna 1117, receives the down link signal from the base station tie point via described reception antenna 1117.Receiver chain 1 1114 comprises the decoder 1118 of the institute's receiving downlink signal that is used to decode.Receiver chain 1 1114 can be tuned as different carrier frequencies.Receiver chain 1 1114 is current through being tuned as corresponding to the carrier frequency f by the employed downlink carrier of tie point A
DLcA1119.Receiver chain 2 1116 comprises the decoder 1120 of the institute's receiving downlink signal that is used to decode.Receiver chain 2 1116 can be tuned as different carrier frequencies.Receiver chain 21116 is current through being tuned as corresponding to the carrier frequency f by the employed downlink carrier of tie point B
DLcB1121.
Transmitter 1104 (for example, the OFDM transmitter) is transferred to tie point with signal (for example, designator), and whether 1100 down link is preferred downlink to the indication of described signal from described tie point to WT.Whether in certain embodiments, transmitter 1104 is transferred in the tie point each (keeping communication link with it) with at least one signal, be the preferred link that wireless terminal is selected with the down link that is indicated to described tie point to described tie point.In certain embodiments, for keeping in the link each, via the uplink signalling in the Dedicated Control Channel of together using with described tie point and propagate preferred link indicator.Transmitter 1104 comprises transmitter chain 1 1122 and transmitter chain 2 1124.Transmitter chain 1 1122 is coupled to transmit antenna 1125, will be transferred to the base station tie point from the uplink signal of WT 1100 via described transmit antenna 1125.Transmitter chain 2 1124 is coupled to transmit antenna 1127, will be transferred to the base station tie point from the uplink signal of WT 1100 via described transmit antenna 1127.Transmitter chain 1 1122 comprises the encoder 1128 that the data/information that is used for uplink signal is encoded.Transmitter chain 2 1124 comprises the encoder 1130 that the data/information that is used for uplink signal is encoded.Transmitter chain 1 1122 can be tuned as different carrier frequencies.Transmitter chain 11122 is current through being tuned as corresponding to the carrier frequency f by the employed uplink carrier of tie point A
ULcA1129.Transmitter chain 2 1124 can be tuned as different carrier frequencies.Transmitter chain 2 1124 is current through being tuned as corresponding to the carrier frequency f by the employed uplink carrier of tie point B
ULcB1131.In certain embodiments, same antenna and (for example) duplex module one are used from least some in receiver chain 1 1114, receiver chain 2 1116, transmitter chain 1 1122 and the transmitter chain 2 1124.
User I/O device 1108 (for example, microphone, keyboard, key plate, mouse, camera, switch, display, loud speaker etc.) provide the operation (for example, initialization one communication session) of an interface for the user of WT 1100 with input user data, output user data, controlling application program and control wireless terminal.Memory 1110 comprises routine 1132 and data/information 1134.Processor 1106 (for example, the CPU) routine 1132 in the execute store 1110 and use data/information 1134 in the memory 1110 with the operation of control wireless terminal and implement method of the present invention.
Link module 1137 keep simultaneously with the link of a plurality of different tie points (for example, with first Radio Link of tie point A and with second Radio Link of tie point B).Link selection module 1138 is selected the preferred downlink wireless link from keeping communication link.Link selection module 1138 is selected preferred downlink based on following at least one: the traffic load conditions at the place of one in determined signal to noise ratio, determined signal-to-jamming ratio, received signal ionization meter, the described tie point, and the type that arrives the business of wireless terminal.Preferred link reporting modules 1139 executable operations with the preferred communications link signaling in described tie point at least one.In certain embodiments, the preferred link reporting modules is coupled to transmitter 1104.In certain embodiments, transmitter 1104 is contained in the preferred link reporting modules as its part.Signal measurement module 1182 is measured the signal that receives from least two network connection points.Signal measurement module 1182 is coupled to link selection module 1138, and is provided at the signal measurement information of the function of the down link signal of selecting to be used as in the preferred downlink at least two tie points receptions from be contained in described a plurality of tie point.In certain embodiments, signal measurement module 1143 is carried out the measurement of the pilot signal that is received from two base station tie points for the selection of pilot signal measurement module and preferred downlink is based at least.For instance, in certain embodiments, the pilot signal that receives from least two tie points is through measuring, handle (for example, filtering), relatively, and is used to select preferred downlink.SNR module 1141 is measured the signal to noise ratio of the signal that is received on different links.SIR module 1142 is measured the signal-to-jamming ratio of the signal that is received on different links.Business module 1143 is followed the trail of the traffic load conditions at different tie points place and is waited to propagate into the type of the business of wireless terminal.Make information can be used for link selection module 1138 is selected consideration for downlink preferred link usefulness from business module 1143.
Data/information 1134 comprises user/device/session/resource information 1144, downlink user data 1148, tie point A information 1146, tie point B information 1147, preferred link information 1149 and system information 1150.User/device/session/resource information 1144 (for example comprises device information, the Control Parameter that is associated with the type of WT 1100, model etc.), with and the communication session of WT 1100 in peer node (peer node) information, routing information, addressing information, the radio link resource information (air link resource information) (for example, being assigned to up link and the down link section of WT 1100) that are associated.Downlink user data 1148 comprises user data, and () institute's received frame for example, voice data, view data, voice data text, file data etc., it is by one or more in the down link and receive.Sometimes in certain embodiments, corresponding to specific ongoing communication session and/or application, via to first link of first tie point and the first of receiving downlink data stream, and via to second link of second tie point and the second portion of receiving downlink data stream.Preferred link information 1149 is for the output of link selection module 1139 and comprise from the information of observing WT 1100, and described information indicates which link is current to be preferred downlink.Preferred link information 1149 is used as input by reporting modules 1139.
Tie point A information 1146 is corresponding to that kept and first wireless communication link first tie point, and tie point B information 1147 is corresponding to that kept and second wireless communication link second tie point simultaneously.Each base station tie point (A, B) is coupled to network (for example, provide via backhaul network other network nodes communication path) with wireless terminal 1100.According to the present invention, wireless terminal 1100 can be kept two ongoing links with two tie points simultaneously, and can select current preferred downlink on ongoing basis and described selection is propagated into tie point.
Tie point A information 1146 (for example comprises terminating machine identifying information 1151, the identifier that is associated with Dedicated Control Channel that assign the base station), base station identification information 1152 (for example, discern the information of base station by beacon tone and/or pilot tone signaling pattern), sector ID information 1153 (for example, discerning the information of sector) by beacon tone and/or pilot tones signaling pattern.Tie point A information 1146 comprises carrier information 1154, for example, and the information of up link that identification is used by tie point A and downlink carrier frequency and/or the tone blocks used by tie point A.Tie point A information 1146 (for example also comprises signal strength information 1155, from tie point A the measurement of the beacon that receives and/or pilot signal), measured SNR 1156 (for example, the signal to noise ratio that is associated with received signal) and the measured SIR 1157 that is associated with tie point A (for example, based on the beacon that is received, pilot tone and/or empty tone (null tone) signal interferometry) from tie point A.Signal strength signal intensity 1155, measured SNR 1156 and measured SIR 1157 are the output of signal measurement module 1182.Tie point A information 1146 (for example also comprises business information 1158, considering that business information type that for example tie point A and B and expectation propagate (for example, require and/or use (for example, sound, text etc.) aspect in the grade of service, priority, stand-by period) situation under estimated business load at each tie point place).Business information 1158 is the output of business module 1143.Tie point A information 1146 also comprises the information 1180 (for example, the filter value of metrical information) through filtering.For instance, in certain embodiments, the signal strength signal intensity from the pilot signal that receives of tie point A is measured and filtering, and value through filtering (for example, when preferred link change so that provide when lagging behind) is provided.Tie point A information 1146 also comprises uplink signal information 1159, Dedicated Control Channel (DCCH) pattern information 1161 and downlink signal information 1162.Uplink signal information 1159 comprises DCCH signal message 1160 (for example, comprising the DCCH report of preferred link indicator).Downlink signal information 1162 comprises downlink user data 1163 frame of the downlink user data of propagating corresponding to the downlink communication chain road of tie point A (for example, via).
Tie point B information 1147 comprises terminating machine identifying information 1164, base station identification information 1165, sector ID information 1166, carrier information 1167, signal strength information 1168, measured SNR 1169, measured SIR 1170, business information 1171, filtering information 1181, uplink signal information 1172, Dedicated Control Channel (DCCH) pattern information 1174 and downlink signal information 1175.Uplink signal information 1172 comprises DCCH signal message 1173.Downlink signal information 1175 comprises downlink user data 1176.Tie point B info class is similar to tie point A information but corresponding to the different wireless communication link, and therefore is not described in detail.
Figure 12 is for according to the present invention and use the figure of the exemplary base station 1200 (for example, access node) that method of the present invention implements.Exemplary base station 1200 is the exemplary OFDM base station in (for example) OFDM spread spectrum multiple access wireless communication system.Exemplary base station 1200 is the base station of three sectors.According to the present invention, other base stations can comprise the sector (for example,, two or three above sectors) of different numbers.In the one exemplary embodiment of Figure 12, be described as providing three tie points with base station 1200, wherein each sector is corresponding to a tie point.In certain embodiments, each sector can be corresponding to a plurality of tie points.For instance, a given sector can be supported a plurality of tone blocks (for example, three downlink tone blocks), and each tone blocks of each sector can be corresponding to a tie point.Use among this kind embodiment of three downlink tone blocks or three downlink carriers in each sector, the base station of three sectors has nine different tie points.
Each transmitter (1204,1208,1212) is coupled to the transmit antenna (1224,1228,1230) of respective sectors respectively, wherein base station section is transferred to wireless terminal via described antenna with down link signal (down link signal that for example, comprises the user data of propagating via traffic channel segments).Transmitter (1204,1208,1212) comprises the encoder (1235,1238,1242) that is respectively applied for the coding down link signal.
I/O interface 1216 is coupled to internet and/or other network nodes (for example, other base stations, router, initial agent node (home agent node), AAA node, centralized control node etc.) with base station 1200.I/O interface 1216 is coupled to backhaul network with base station 1200, thus for the wireless terminal of one in the tie point that uses base station 1200 communication path is provided so that its can be arranged in different districts and use other wireless terminals to communicate corresponding to the tie point of different base station.
The various communication protocols that communication routines 1248 is implemented by base station 1200 uses.The operation that the control of base station section 1 control routine 1250 and sector 1 are relevant; The operation that the control of base station section 2 control routines 1252 and sector 2 are relevant; The operation that the control of base station section 3 control routines 1254 and sector 3 are relevant.Base station section 1 control routine 1250 comprises Scheduler module 1256, down link data signalling module 1258, preferred link detection module 1260 and pilot/beacon signalling module 1262.Scheduler module 1256 (for example, scheduler is a wireless terminal scheduling radio link resource (for example, up link and downlink channel segment)) uses base station section 1 as its tie point.Down link data signalling module 1258 control is forwarded to the user data propagated via being maintained at the down link between sector 1 transmitter and the wireless terminal treated of sector 1 transmitter.The information that preferred link detection module 1260 is handled from the uplink signal of each wireless terminal of keeping a link, and determine whether described wireless terminal is considered as current preferred downlink (for example, via the preferred link indicator value of propagating) with down link in Dedicated Control Channel.Pilot/beacon module 1262 produces beacon and/or pilot signal according to the timing of being used by base station section and frequency structure (for example, using specific tone at special time with the reproduction sequence).In certain embodiments, the pilot tone that receives and/or beacon signal be to measure and be used to select preferred downlink by wireless terminal.Whether Scheduler module 1256 and/or down link data signalling module 1258 are the preferred link of wireless terminal according to down link and determine and what downlink user data should be propagated into wireless terminal according to preferred link Rule Information 1288.In certain embodiments, can cooperate to determine propagating what information on down link with other nodes (for example, other base stations and/or centralized node) in base station 1200.
Data/information 1246 comprises a plurality of groups data message (sector 1 data/information 1264, sector 2 data/information 1266, sector 3 data/information 1268).Sector 1 data/information 1264 comprise a plurality of groups WT information (WT 1 data/information 1270 ..., WTN data/information 1284), it is separately corresponding to a WT who is served by the base station section tie point.WT 1 data/information 1274 (for example comprises user data 1274, voice data, voice data, view data, text data, file data, it can be propagated with the frame form via the down link of being kept), indicated preferred link information 1276 (for example, whether be regarded as the indicator value of the preferred downlink of current time by the identification down link of module 1260 recoveries), wireless terminal identifier 1278 (for example, the base station assign with the DCCH channel segment, the validated user identifier that DCCH pattern (for example, full DCCH pattern or 1/3DCCH pattern) is associated) and device/session/resource information 1282.Device/session/resource information 1282 comprise the information (for example, type of device and Control Parameter) that is associated with WT 1, with and the communication session of WT 1 in peer node information, addressing information, routing information and the radio link resource information (for example being assigned to up link and the down link section of WT 1) that are associated by Scheduler module 1256.
Just share the special feature of what and individual sector between the sector, various embodiment can have the difference of routine and/or data/information and divide.
Can implement feature of the present invention by using one or more modules.Be used to implement module of the present invention can by use software, hardware is implemented or be embodied as software and the combination of hardware.
Can (for example for example be contained in storage arrangement by use, RAM, floppy disc etc.) machine-readable medium in machine-executable instruction (for example, software) (for example implement many said methods or method step with the control machine, has or do not have the all-purpose computer of additional hardware), thereby implement said method all or part of (for example, in one or more communication network nodes).Therefore, the present invention especially about comprising machine-executable instruction so that machine (for example processor and associated hardware) is carried out the machine-readable medium of one or more steps in the step of said method.
In view of above description the of the present invention, it will be apparent to those skilled in the art that many extra variation about method and apparatus of the present invention.These variations should be considered as within the scope of the invention.Method and apparatus of the present invention can (and in a plurality of embodiment really) be used for CDMA, Orthodoxy Frequency Division Multiplex (OFDM) and/or be used in access node and mobile node between the communication technology of the various other types of wireless communication link is provided.In certain embodiments, access node is embodied as the base station of the communication link that uses OFDM and/or CDMA foundation and mobile node.In various embodiments, mobile node is embodied as mobile computer, personal digital assistant (PDA) or comprises receiver/transmitter circuit and other portable devices of logic and/or routine, to implement method of the present invention.
Claims (26)
1. the method for an operate wireless terminating machine, it comprises:
Keep communication link simultaneously with a plurality of different tie points;
From the described communication link of keeping, select the preferred downlink wireless communication link; And
With described preferred communications link signaling at least one in described tie point.
2. method according to claim 1, wherein the down link signal that receives according at least two tie points that comprised from described a plurality of tie points is carried out and is selected preferred downlink.
3. method according to claim 2, it further comprises:
Repeat described selection step and described signaling step.
4. method according to claim 3, wherein said selection preferred downlink be based on following at least one: definite signal to noise ratio, the traffic load conditions at the place of one in definite signal-to-jamming ratio, received signal ionization meter, the described tie point, and to the type of the business of described wireless terminal.
5. method according to claim 3, wherein based on to from described base station at least the measurement of both pilot signals of receiving carry out described selection preferred downlink.
6. method according to claim 3, wherein said signaling comprise described preferred downlink are propagated in the described tie point of keeping communication link with it each.
7. method according to claim 6, it further comprises:
Keep the dedicated uplink communication channel of keeping in the described tie point of communication link each with described wireless terminal with it, and
Wherein, use described dedicated uplink traffic channel to indicate the described signaling of described preferred downlink.
8. method according to claim 7, it further comprises:
Described preferred link information and chnnel coding report information are encoded jointly; And
Pass on the described encoded signal of described preferred link information and channel condition report information via described Dedicated Control Channel transmission.
9. method according to claim 8, it further comprises:
Via at least one receiving downlink user data in the described downlink channel, described downlink channel is determined by in the described base station at least one.
10. method according to claim 9, wherein said selected downlink channel are described indicated preferred channel.
11. method according to claim 9, wherein said selected downlink channel are different from described indicated preferred downlink channel.
12. method according to claim 3, wherein said selection preferred downlink communication link causes selecting to be different from the down link of current preferred downlink, needs a delay period before the new current preferred downlink of permission changes.
13. method according to claim 12, the length of wherein said delay are the predetermined period corresponding to the downlink transmission time slot of predetermined number.
14. method according to claim 12, wherein determine described delay by the time that the pre-determined numbers of described preferred link signaling in described a plurality of base stations are required, the time between the signaling just with which operation mode in a plurality of operator schemes decides on described wireless terminal.
15. method according to claim 1, the described preferred link of wherein said selection comprises:
Processing from the signal of different down links to produce signal quality based on each link;
The signal quality that produced and the signal quality of described current preferred link are compared; And
When described signal quality indication of relatively indicating described current preferred link with above the difference between the signal quality of another link of threshold value the time, select new current preferred link.
16. method according to claim 15, it further comprises:
The time quantum that remains unchanged according to described current preferred link changes described threshold value.
17. method according to claim 15, it further comprises:
The time quantum change that remains unchanged according to described current preferred link is used for producing the described processing of signals to produce signal quality based on each link from different down links.
18. method according to claim 1, wherein said tie point is corresponding to the different base station of the neighbor cell that is arranged in communication system.
19. method according to claim 1, wherein said tie point is corresponding to the different sectors of same cells.
20. method according to claim 1, wherein said tie point is corresponding to the different tone blocks of a sector.
21. a wireless terminal, it comprises:
Link module, it is used for keeping simultaneously the communication link with a plurality of different tie points;
The link selection module, it is used for selecting the preferred downlink wireless communication link from the described communication link of keeping; And
The preferred link reporting modules, it is used for described preferred communications link signaling at least one of described tie point.
22. wireless terminal according to claim 21, it further comprises:
Receiver, it is used for from least two tie point received signals; And
Signal measurement module, it is used to measure the signal that receives from described at least two tie points, described signal measurement is coupled to described link selection module, to be provided for selecting according to the down link signal that at least two tie points that comprised receive the signal measurement information of preferred downlink from described a plurality of tie points.
23. wireless terminal according to claim 22, it further comprises the snr measurement module of the signal to noise ratio that is used to measure the signal that is received on different links.
24. wireless terminal according to claim 22, wherein said selection module is selected preferred downlink based on following at least one: the traffic load conditions of locating in the definite signal to noise ratio of institute, institute definite signal-to-jamming ratio, received signal ionization meter, the described tie point, and the type that arrives the business of described wireless terminal.
25. wireless terminal according to claim 22, wherein said signal measurement module are pilot signal measurement module, and wherein said selection preferred downlink be based on measurement from described base station at least both pilot signals of receiving carry out.
26. wireless terminal according to claim 23, wherein said preferred link reporting modules comprises the OFDM transmitter, described OFDM transmitter is used at least one signal is transferred to each of the described tie point of keeping communication link with it, with the described preferred downlink of being selected by described wireless terminal to described tie point indication.
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| US72658805P | 2005-10-13 | 2005-10-13 | |
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| CN201510043547.4A Division CN104619048A (en) | 2005-10-13 | 2006-10-11 | Methods and apparatus for selecting and signaling a preferred link among a plurality of maintained wireless communications links |
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