CN100359989C - Method for setting active time displacement of user equipment - Google Patents
Method for setting active time displacement of user equipment Download PDFInfo
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- CN100359989C CN100359989C CNB200410069784XA CN200410069784A CN100359989C CN 100359989 C CN100359989 C CN 100359989C CN B200410069784X A CNB200410069784X A CN B200410069784XA CN 200410069784 A CN200410069784 A CN 200410069784A CN 100359989 C CN100359989 C CN 100359989C
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Abstract
The present invention discloses a method for activating time offset with user equipment, which is applied to a wireless communication system for determining the activation time of user equipment. The present invention comprises the procedures: a value which influences the reference index of oral signaling transmission efficiency is obtained; the current oral signaling transmission efficiency of a wireless communication system is determined according to the reference index, and activation time offset is selected according to the current oral signaling transmission efficiency. The method of the present invention can dynamically set the activation time offset according to the specific condition of network environments.
Description
Technical field
The present invention relates to wireless communication field, especially relate to a kind of method by the space interface signaling setting active time displacement of user equipment.
Background technology
Universal Mobile Telecommunications System air interface (the Uu of Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, UMTSAir Interface) signaling procedure requires subscriber equipment (UE, User Equipment) switches to specific configuration in the specific moment, described particular moment is known as " activation moments ", be somebody's turn to do " activation moments " by Universal Mobile Telecommunications System grounding wireless access network (UTRAN, UMTS Terrestrial Radio AccessNetwork) disposes to UE (because the transmission of Uu interface signaling needs the regular hour by the Uu interface signaling, therefore select active time displacement by UTRAN usually, the Uu interface signaling of active time displacement relevant information is carried in transmission, and UE receives behind the Uu interface signaling in activation moments handover configurations).Described Uu interface signaling can be that radio bearer (RB, Radio Bearer) is set up signaling, RB reprovision signaling, transmission channel reprovision signaling, physical channel reprovision signaling etc.According to the regulation of agreement 3GPP TS25.33 1, the value of this activationary time can be " activating immediately " (" Now "), can be Connection Frame Number (CFN, the Connection Frame Number) expression of (0～255) by span also.
A kind of prior art of subscriber equipment activation moments of selecting is: the transmission quality of a certain specific WCDMA wireless network is divided into 3 ranks, and 3 ranks require active time displacement Δ T inequality, i.e. Δ T1, Δ T2, Δ T3 respectively.For identical network settings, the value of Δ T1, Δ T2, Δ T3 is fixed, in actual sampling process, in order to take into account the success rate of the signaling procedure under most signaling transmission qualities, network has only the each active time displacement Δ T that distributes of conduct that chooses a maximum among Δ T1, Δ T2, the Δ T3 three.The value of Δ T is between 1 second and 2 seconds under the general networking condition.The maximum of agreement regulation Δ T is 2.56 seconds.
The above-mentioned shortcoming that the method for time migration is set is: for identical network, the active time displacement Δ T that is provided with fixes, it can not carry out dynamically adjusting in real time with the difference of network quality, thereby cause in the actual application, the active time displacement amount occurs with respect to different network qualities excessive or too small situation is set, bring some defectives.This is because the transmission of Uu interface signaling needs the regular hour, and under the situation of certain error rate, error code also might take place and cause the recipient to resolve in the Uu interface signaling, thereby require radio network controller (RNC, Radio Network Control) retransmit corresponding signaling unit, the Uu interface propagation delay time of signaling will increase along with the increase of signaling unit retransmission rate.The interface signaling that comprises active time displacement that network sends to UE is subjected to the influence of the above-mentioned error rate equally when transmitting by the Uu interface.Under the certain situation of Uu interface error code rate, the time offset of activation moments and current time (moment of UTRAN notice UE activation moments signaling) is excessive or too small all improper.
For the excessive situation of active time displacement amount, can cause subscriber equipment to wait for the overlong time of configuration take-effective, all comprise the signaling procedure time delay increase of activation moments to cause professional foundation, business modification, switching etc.
See also Fig. 1, setting up process with RB is example, and the excessive influence to signaling procedure of active time displacement amount is described.The RNC side is set up message (RB Setup) with RB and is divided into several packets and sends to the UE side successively, T1 represents that RNC sends the moment of first packet of RB Setup message, T2 represents that last packet of RBSetup message arrives the moment of UE, the activation moments of RB Setup message indication is (T1+ Δ T), and wherein Δ T is the active time displacement amount.
If (T1+ Δ T) greater than T2, then UE will wait for that (T1+ Δ T-T2) constantly could use the configuration information of RB Setup message appointment after receiving RB Setup message, set up to RNC response radio bearer then and finish message (RB Setup Complete).Δ T is big more, then time of before using new configuration, waiting for of UE long more, RNC receives that the time of RB Setup Complete message is also just late more.
And for the too small situation of active time displacement amount, when the activation moments of network configuration has arrived, comprise the Uu interface signaling of activation moments information may be still under the Uu interface line number pass certain intermediate link of passage, also do not arrive UE fully.Because general networking and the UE configuration before and after activation moments is inequality, therefore arrive the configuration after network behind the activation moments will switch to activation moments; But, UE still is in the configuration before the activation moments owing to there is not the complete signaling (signaling that promptly comprises activation moments information) of notified its change state, thereby this moment network and UE configuration occur inconsistent, and then cause UE can't continue to receive any downlink signaling, thereby the configuration of deadlock before activation moments, network also possibly can't receive any up signaling that UE sends, and finally causes the line number up and down between network and the UE to pass interruption fully.
See also Fig. 2, setting up process with RB is example, and the too small influence to signaling procedure of active time displacement amount is described.If (T1+ Δ T) is less than T2, then RNC switches to new configuration constantly and continues to send the remaining packet of RB Setup message according to new configuration at (T1+ Δ T), and UE has only and receives that fully RB Setup message could obtain configuration information after the activation moments according to the content of RB Setup message, therefore UE can't resolve the packet of the RB Setup message of receiving after (T1+ Δ T) moment, thereby can not recombinate out RB Setup message, cause follow-up process also can't carry out, network also can't be received the RB Setup Complete message of UE.Therefore, this RB Setup procedure failure.
In sum, as (T1+ Δ T) when equaling T2, can under the prerequisite that guarantees the signaling procedure success, obtain minimum time delay.But this is a kind of ideal situation, because network condition varies, and the signaling transmission quality between RNC and the UE also varies, the moment T2 that the message that RNC sends arrives UE is difficult to determine in the real network.Signaling transmission quality between RNC and the UE is poor more, and T2 is obviously also big more, otherwise more little.Therefore, prior art adopts fixing active time displacement obviously to have weak point.
Summary of the invention
In order to overcome the defective that prior art adopts fixing active time displacement to bring, the technical problem that the present invention solves is to provide a kind of method of setting active time displacement of user equipment, can dynamically set active time displacement according to the concrete condition of network environment.
The present invention in order to the technical scheme of technical solution problem is: a kind of method of selecting active time displacement of user equipment is provided, is applied to wireless communication system to determine the activationary time of subscriber equipment; Comprise step:
1) obtains the transmission channel Block Error Rate;
2), determine Radio Link control number of retransmissions according to described transmission channel Block Error Rate;
3) estimate current space interface signaling efficiency of transmission according to Radio Link control number of retransmissions;
4), estimate that current signaling is in the success transmission time expense of eating dishes without rice or wine according to current space interface signaling efficiency of transmission;
5) select active time displacement according to described transmission time expense.
The present invention also provides another method of selecting active time displacement of user equipment, is applied to wireless communication system to determine the activationary time of subscriber equipment; Comprise step:
A) flow that obtains channel accounts for the value of total flow percentage;
B), determine the current available remaining bandwidth percentage of wireless communication system according to described percent value;
C), obtain active time displacement according to current available remaining bandwidth percentage.
Compared with prior art, the invention has the beneficial effects as follows: because the present invention at first obtains the value of the reference index that influences the space interface signaling efficiency of transmission, and the current space interface signaling efficiency of transmission of evaluating wireless communication system in view of the above, select active time displacement according to the space interface signaling efficiency of transmission then, can overcome prior art to greatest extent and adopt fixing active time displacement setting, cause the excessive or too small drawback of bringing of activationary time, thereby reduce time delay, the raising signaling procedure success rate of signaling procedure.
Description of drawings
Fig. 1 is that the active time displacement amount is provided with the schematic diagram when excessive;
Fig. 2 is that the active time displacement amount is provided with the schematic diagram when too small;
Fig. 3 is the flow chart of the method for setting active time displacement of user equipment of the present invention;
Fig. 4 is the interlayer relation schematic diagram of space interface signaling transmission course;
Fig. 5 is that the embodiment of the invention uses the Block Error Rate of uplink transport channel to set the flow chart of active time displacement.
Embodiment
The method of setting active time displacement of user equipment of the present invention is dynamically adjusted the each configuration of network and is given the activation moments of UE and the time migration of current time, determine current space interface signaling efficiency of transmission according to the current network environment, and dynamically adjust active time displacement on this basis in real time, thereby overcome the excessive or too small drawback of bringing of active time displacement to greatest extent.
See also Fig. 3, the method for setting active time displacement of user equipment of the present invention comprises:
Step S1 obtains the value of the reference index that influences the space interface signaling efficiency of transmission.
In real network, the reference index that influences the space interface signaling efficiency of transmission mainly comprises: the distance between transmission channel Block Error Rate, physical channel bit error rate, transmission channel bandwidth, physical channel bandwidth, base station and the mobile phone etc.Wherein the physical channel bit error rate is similar to transmission channel Block Error Rate implication, though the former is the index of physical channel, the latter is the index of transmission channel, but adopts the method for physical channel bit error rate estimation space interface signaling efficiency of transmission similar to the method that adopts transmission channel Block Error Rate estimation space interface signaling efficiency of transmission.Channel width comprises transmission channel bandwidth and physical channel bandwidth, because transmission channel is mapped on the physical channel, so the two is basically identical on variation tendency.
Step S2 according to the above-mentioned reference index, determines the current space interface signaling efficiency of transmission of wireless communication system.
Seeing also Fig. 4, is the interlayer relation schematic diagram of space interface signaling transmission course.
Wherein, radio resource control layer message (RRC, Radio Resource Control) is meant the space interface signaling between RNC and the UE.The RRC signaling at first is divided into one or more wireless chain control layer transmission blocks (RLC PDU, Radio Link Control Protocol Data Unit) when sending, carry out RNC by RLC PDU and communicate by letter with the rlc layer between the UE; Each RLC PDU can be split into one or more medium access key-course protocol Data Unit (MAC PDU again, Medium AccessControl Protocol Data Unit), send through a plurality of transmission time intervals (TTI), carry out RNC and communicate by letter with the MAC layer between the UE.
MAC is according to CRC (the Cyclic Redundancy Code of each MAC PDU, cyclic redundancy code) the check mark position judges whether this PDU the CRC check mistake occurs, the MAC PDU of CRC check mistake (the especially data block of RRC signaling) is considered to invalid PDU, and will be dropped.The mistake of MAC PDU will cause recombinating and recover corresponding RLC PDU, and RLC also can't recombinate and recover the RRC signaling then.Therefore RLC need be to because the mistake piece causes the MAC RLC PDU that recovers that can't recombinate to retransmit.When RLC was operated in affirmation mode, RLC carried out serial number to each PDU, and the PDU sequence number that the wrong PDU of MAC will cause RLC to receive can not be continuous, and the retransmission mechanism of RLC will be to the retransmitting of PDU of disappearance.
Because MAC PDU mistake also can appear in the retransmission processes of RLC, can only say that therefore the re-transmission of RLC can improve the probability of receiving disappearance RLC PDU, number of retransmissions is many more, receives successfully that then the probability of disappearance RLC PDU is big more.Because data send by eating dishes without rice or wine and accept to need the regular hour, therefore retransmit the time delay that will cause the final successfully reorganization of RLC to recover space interface signaling and be multiplied, reduce the space interface signaling efficiency of transmission.Therefore, up BLER (Block Error Rate) is big more, and RLC PDU number of retransmissions is many more; BLER is big more, and the RLC PDU re-transmission probability of success is low more, and the space interface signaling efficiency of transmission is low more.
Under the situation of 1% transmission channel Block Error Rate (corresponding physical channel bit error rate is less than 1%) of present industry common configuration, because the wireless telecommunication system error code takes place at random, part or all of may can't the parsing in these transmission blocks owing to error code.The RLC reliability guarantees that mechanism can retransmit these data blocks that can't resolve, thereby can finally improve the transmission success rate of space interface signaling.
Under the prerequisite that guarantees the space interface signaling transmission success, transmission channel Block Error Rate or physical channel bit error rate are high more, then require the average repeat time of RLC high more.RLC retransmits the time overhead caused and is directly proportional with the RLC number of retransmissions, so transmission channel Block Error Rate or physical channel bit error rate are high more, and expense average time of the successful transmission requirement of space interface signaling is also big more.
The physical channel bit error rate is similar to transmission channel Block Error Rate implication, adopts the method for physical channel bit error rate estimation space interface signaling efficiency of transmission to estimate that to adopting the transmission channel Block Error Rate method of signaling efficiency of transmission is similar.
Channel width comprises transmission channel bandwidth and physical channel bandwidth, and channel width has determined to transmit in the unit interval maximum capacity of the data of eating dishes without rice or wine, and is directly proportional in the propagation delay time of eating dishes without rice or wine with signaling.
Distance between base station and the mobile phone is also influential to the efficiency of transmission of space interface signaling, distance between base station and the mobile phone determined to eat dishes without rice or wine propagation time of radio wave, so the propagation delay time of space interface signaling also will increase and decrease along with the increase and decrease of the distance between base station and the mobile phone.
Step S3 according to current space interface signaling efficiency of transmission, selects active time displacement.
At first, estimate the time overhead that signaling needs by the success transmission of eating dishes without rice or wine according to described current efficiency of transmission of eating dishes without rice or wine; Secondly, under the prerequisite that guarantees the signaling procedure success,, adopt the principle of the time delay minimum of signaling procedure that active time displacement amount Δ T is set according to described time overhead.
Be appreciated that whether can effective key be estimate current space interface signaling efficiency of transmission accurately the dynamic adjustment of active time displacement amount, and then estimate the time overhead that current signaling needs in the success transmission of eating dishes without rice or wine.For the certain signaling of length, the efficiency of transmission of eating dishes without rice or wine is high more, and then this signaling is just few more by the time that the success transmission of eating dishes without rice or wine is spent; Otherwise, just many more.
See also Fig. 5, in the specific embodiment of the present invention, use the foundation of the Block Error Rate of uplink transport channel, and determine active time displacement of user equipment according to current space interface signaling efficiency of transmission as the current space interface signaling efficiency of transmission of estimation.
The flow process of described embodiment is: execution in step S11 at first, add up up BLER by the MAC of RNC, and described BLER represents the Block Error Rate of uplink transport channel, promptly the number of the transmission block of up mistake accounts for the ratio of uplink transport channel total block data.
Step S11 specifically comprises: MAC judges according to the CRC check flag bit of each MAC PDU whether this PDU the CRC check mistake occurs; If CRC flag bit indication CRC check mistake, MAC thinks that then this PDU is the mistake piece, statistics mistake piece number; The uplink mistake piece number of described MAC statistics is drawn the block error rate BLER of uplink transport channel than the total block data of last uplink transport channel.
Step S12 calculates Radio Link control number of retransmissions according to up BLER.
Among the step S12, BLER, RLC PDU number of retransmissions, RLC PDU retransmit between the probability of success three relation as shown in Equation (1):
Wherein P represents that RLC PDU retransmits the probability of success, and x represents BLER, and N represents RLC PDU number of retransmissions.Drawn by formula (1), the high more then RLC of the BLER PDU re-transmission probability of success is low more, otherwise then the RLC PDU re-transmission probability of success is high more.
BLER one regularly when RLC PDU number of retransmissions N satisfies requiring of formula (2), can guarantee the reliable transmission of space interface signaling:
Mx
N＜1...................(2)
Wherein M represents that space interface signaling is divided into the number of MAC PDU, and x represents BLER, and N represents the RLC number of retransmissions.
Illustrate the application of formula (2) below:
If space interface signaling comprises 10 MAC PDU, BLER is 10%, and the formula above satisfying then requires N＞1, from reducing the space interface signaling propagation delay time, improves space interface signaling efficiency of transmission angle, and N is the smaller the better, and therefore, the N value is 2 herein.
Step S13 estimates current space interface signaling efficiency of transmission according to described RLC number of retransmissions, and the RLC number of retransmissions is many more, and the space interface signaling propagation delay time is big more, and the space interface signaling efficiency of transmission is low more, otherwise, high more;
Step S14 estimates that according to the space interface signaling efficiency of transmission current signaling is at the time overhead of success transmission of eating dishes without rice or wine.
If ideally RLC PDU is Tu in the time of eating dishes without rice or wine to send acceptance and once needing, then retransmit N back altogether need time be N * Tu.
Therefore, among the RLC PDU that idle message comprises, the ratio of the number of the transmission block that need retransmit and transmission total block data, and the number of times that each RLC PDU is retransmitted determines the space interface signaling efficiency of transmission, just determine this idle message to transmit needed total time by eating dishes without rice or wine, formula (3) provides the method for estimation in the idle message transmission time of simplification:
T2-T1＝(M+N)Tu...................(3)
Wherein T1 represents the moment of first packet that RNC sends, and T2 represents that last packet of message arrives the moment of UE, and (T2-T1) expression message is transmitted the time that needs by eating dishes without rice or wine, and the implication of M and N is referring to the explanation of formula (2).
Step S15, the time overhead setting of transmitting according to the success of eating dishes without rice or wine activate shift time, and active time displacement is disposed to UE.
For the previously described RB setup message that comprises active time displacement amount Δ T, RNC at first needs to calculate (T2-T1) according to formula (2) and formula (3) when being ready for sending this message, sets Δ T according to formula (4) then:
ΔT≥T2-T1...................(4)
Δ T should be under the situation that satisfies formula 4 the little value of the amount of exhausting, to reach the purpose that guarantees the signaling procedure success and reduce system's time delay.
More than introduced with BLER and weighed the space interface signaling efficiency of transmission, determine the method for active time displacement amount.
The present invention is further described to select the embodiment of active time displacement below in conjunction with foundation channel width.
Channel width has determined to transmit in the unit interval maximum capacity of the data of eating dishes without rice or wine, and transmission channel bandwidth, physical channel bandwidth are directly proportional in the propagation delay time of eating dishes without rice or wine with signaling.Channel width is controlled by RNC, and the big more then signaling of channel width efficiency of transmission is high more.The channel width of carrier signaling can be divided into 3 ranks, rank 1 corresponding descending use forward access channel (FACH) carrier signaling; Rank 2 corresponding utilized bandwidths are 3.4Kbps dedicated channel (DCH) carrier signaling; The rank 3 corresponding 13.6Kbps DCH carrier signalings that use.
Select the process of active time displacement amount different when using this other channel width carrier signaling of three levels.
The process of setting the active time displacement amount during FACH carrier signaling is: the FACH flow of RNC side in the statistics current time; If the traffic statistics of FACH are the n% of total flow, then current available remaining bandwidth percentage is (1-n%); It is Δ T/ (1-n%) that active time displacement is set, and Δ T is under the situation of certain transmission channel bit error rate and the traffic statistics of FACH are the active time displacement of 0 o'clock correspondence.
Though the total bandwidth of FACH channel is higher, as Common transport channel, may be that a plurality of subscriber equipmenies use in the sub-district simultaneously, the actual bandwidth that obtains of every subscriber equipment just can be little more a lot of than total bandwidth, and specifically the load by FACH determines.The FACH load is high more, and for unique user equipment, the signaling efficiency of transmission of FACH is low more; Otherwise the signaling efficiency of transmission of FACH is high more.RNC can obtain the FACH traffic statistics in a period of time in real time, as the foundation of weighing the FACH load.
When if the bandwidth of FACH exclusively enjoys for unique user equipment, promptly till current in a period of time the traffic statistics of FACH be 0, and under the situation of certain transmission channel bit error rate, requirement to active time displacement is Δ T, then when the traffic statistics of FACH are the n% of total flow, be Δ T/ (1-n%) to the requirement of active time displacement.Be how many relative total bandwidths of current available bandwidth reduces doubly, then the active time displacement amount of Yao Qiuing is just corresponding increases what doubly.
When bandwidth is 3.4Kbps DCH carrier signaling and bandwidth estimate signaling efficiency of transmission method when being 13.6Kbps DCH carrier signaling: the bandwidth of DCH channel exclusively enjoys for unique user equipment, its signaling efficiency of transmission evaluation method is equivalent to " when the bandwidth of FACH exclusively enjoys for unique user equipment " and " sets the process of active time displacement amount during the FACH carrier signaling ", difference only is that channel width difference and transmission channel bit error rate setting can be not identical, the specific descriptions of evaluation method repeat no more here referring to preamble.
Distance between base station and the mobile phone is also influential to the efficiency of transmission of space interface signaling, distance between base station and the mobile phone determined to eat dishes without rice or wine propagation time of radio wave, so the propagation delay time of space interface signaling also will increase and decrease along with the increase and decrease of the distance between base station and the mobile phone.When radius of society was not too big, the propagation time of radio wave was less relatively to the influence of the propagation delay time of space interface signaling.
The above only is a preferred implementation of the present invention, does not constitute the qualification to protection range of the present invention.Any any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (8)
1, a kind of method of selecting active time displacement of user equipment is applied to wireless communication system to determine the activationary time of subscriber equipment; It is characterized in that, comprise step:
1) obtains the transmission channel Block Error Rate;
2), determine Radio Link control number of retransmissions according to described transmission channel Block Error Rate;
3) estimate current space interface signaling efficiency of transmission according to Radio Link control number of retransmissions;
4), estimate that current signaling is in the success transmission time expense of eating dishes without rice or wine according to current space interface signaling efficiency of transmission;
5) select active time displacement according to described transmission time expense.
2, the method for selection active time displacement of user equipment as claimed in claim 1 is characterized in that: described step 2), adopt formula
Mx
N＜1
Select the space interface signaling number of retransmissions; Wherein, M represents the divided number of space interface signaling, and x represents the transmission channel Block Error Rate, and N represents number of retransmissions.
3, the method for selection active time displacement of user equipment as claimed in claim 1 is characterized in that: in the described step 4), adopt formula
T2-T1＝(M+N)Tu
The decision time overhead; Wherein, T1 represents to send the moment of first packet of space interface signaling, T2 represents that last packet of space interface signaling arrives the moment of subscriber equipment, T2-T1 express time expense, M represents the divided number of space interface signaling, N represents number of retransmissions, and Tu representation unit transmission block is in the time of eating dishes without rice or wine transmission primaries.
4, a kind of method of selecting active time displacement of user equipment is applied to wireless communication system to determine the activationary time of subscriber equipment; It is characterized in that, comprise step:
A) flow that obtains channel accounts for the value of total flow percentage;
B), determine the current available remaining bandwidth percentage of wireless communication system according to described percent value;
C), obtain active time displacement according to current available remaining bandwidth percentage.
5, the method for selection active time displacement of user equipment according to claim 4 is characterized in that: described channel is descending use forward access channel.
6, the method for selection active time displacement of user equipment according to claim 4 is characterized in that: it is the dedicated channel of 3.4Kbps and 13.6Kbps that described channel is to use bandwidth.
7, according to the method for claim 4,5 or 6 described selection active time displacement of user equipment, it is characterized in that: in the described step b), adopt formula
1-n％
Determine the current available remaining bandwidth percentage of wireless communication system, wherein, n% represents that the flow of channel accounts for the value of total flow percentage.
8, according to the method for claim 4,5 or 6 described selection active time displacement of user equipment, it is characterized in that: in the described step c), adopt formula
ΔT/(1-n％)
Obtain active time displacement, wherein, Δ T is illustrated under the situation of certain transmission channel bit error rate and traffic statistics are the active time displacement of 0 o'clock correspondence.
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|---|---|---|---|---|
| WO1999050972A2 (en) * | 1998-03-31 | 1999-10-07 | Nokia Networks Oy | Delay control method |
| WO2001097411A1 (en) * | 2000-06-12 | 2001-12-20 | Samsung Electronics Co., Ltd | Method of assigning an uplink random access channel in a cdma mobile communication system |
| WO2002001742A1 (en) * | 2000-06-24 | 2002-01-03 | Samsung Electronics Co., Ltd | Apparatus and method for synchronization of uplink synchronous transmission scheme in a cdma communication system |
| EP1199853A1 (en) * | 2000-06-12 | 2002-04-24 | Matsushita Electric Industrial Co., Ltd. | Internode synchronizing device, and internode synchronizing method |
| EP1359776A1 (en) * | 2002-04-30 | 2003-11-05 | Nortel Networks Limited | Method for controlling the exchange of frames between a control unit and at least one radio station, and control unit therefor |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999050972A2 (en) * | 1998-03-31 | 1999-10-07 | Nokia Networks Oy | Delay control method |
| WO2001097411A1 (en) * | 2000-06-12 | 2001-12-20 | Samsung Electronics Co., Ltd | Method of assigning an uplink random access channel in a cdma mobile communication system |
| EP1199853A1 (en) * | 2000-06-12 | 2002-04-24 | Matsushita Electric Industrial Co., Ltd. | Internode synchronizing device, and internode synchronizing method |
| WO2002001742A1 (en) * | 2000-06-24 | 2002-01-03 | Samsung Electronics Co., Ltd | Apparatus and method for synchronization of uplink synchronous transmission scheme in a cdma communication system |
| EP1359776A1 (en) * | 2002-04-30 | 2003-11-05 | Nortel Networks Limited | Method for controlling the exchange of frames between a control unit and at least one radio station, and control unit therefor |
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