CN100426704C - Method for ralizing synchronization in TDD radio communication system - Google Patents
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Abstract
The present invention relates to a method for realizing synchronization in a TDD (Time Division Duplex) radio communication system. After the method establishes unlink synchronization and downlink synchronization on UE (User Equipment), the method does not maintain the uplink synchronization any more according to a closed loop mode that the UE submits an intermediate pilot frequency and a base station issues a timing adjustment signaling. However, through the processing of a downlink public pilot frequency by the UE, the method self carries out timing adjustment according to the timing variation of the downlink public pilot frequency, and adjustment effect can be always accumulated. When the UE has an uplink transmission requirement, uplink transmission timing can be adjusted correspondingly according to a known uplink and downlink timing relationship and an accumulated value of a current downlink timing adjustment quantity. Thereby, under the condition that the UE can not obtain special physical channels which are continuous distributed and can be used for the closed loop timing adjustment, the present invention can maintain an uplink synchronization relationship and restore uplink data transmission in time. Compared with the existing closed loop synchronization, the method has the advantages of simple and reliable maintenance and realization and is especially suitable for the TDD system which is special for optimizing the transmission of data services.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method for realizing synchronization in a time division duplex wireless communication system.
Background
With the rapid development of wireless communication technology, the limited available wireless spectrum has failed to meet the demand for wireless information transmission, which has grown exponentially. For this reason, the need for new techniques that can increase the ability of wireless communication systems to transmit information is also becoming more stringent. The TDD (time division duplex) technology can effectively solve the problem of improving the transmission efficiency of uplink and downlink asymmetric services, where the TDD transmission technology is to transmit uplink and downlink information in the same frequency spectrum by occupying different time periods, which requires that the air interface of the TDD wireless communication system must realize good downlink synchronization and uplink synchronization, otherwise it will cause interference inside the system, and reduce the system capacity.
The time slot structure of a subframe of a TD-SCDMA (time division synchronous code division multiple access) system, which is a narrow-band TDD standard of the third generation wireless communication, is shown in fig. 1, a subframe of TD-SCDMA is fixed for 5ms, and channels corresponding to three special time slots for synchronization are marked in the figure: DwPCH (downlink pilot channel), GP (Guard Period), UpPCH (uplink pilot channel); the rest 7 service time slots are all 0.675ms long, and flexible allocation of uplink and downlink service time slots can be realized by setting uplink and downlink switching points.
For the TD-SCDMA system with the system subframe, the following synchronization method is currently adopted to perform uplink and downlink synchronization:
(1) a UE (User Equipment) starts up and establishes downlink synchronization by receiving a broadcast channel;
(2) after the downlink synchronization is established, the uplink synchronization is established, and the establishment of the uplink synchronization is realized through a random access process initiated by the UE:
after downlink synchronization is established, the UE does not know the distance between the UE and the base station (Node B), and cannot realize accurate uplink synchronization, so to reduce interference to the service timeslot, the UE sends an initial uplink sequence, that is, an uplink synchronization probe sequence, within a time period of the UpPCH; after detecting the sequence, the base station estimates the uplink synchronous timing deviation and informs the UE, and the UE adjusts the uplink transmitting timing according to the value. The specific method comprises the following steps: the UE estimates a propagation delay δ t caused by a path loss from the received power of a P-CCPCH (Primary Common control Channel) and/or DwPCHpThen the transmission time T of UpPCHTX-UpPCHComprises the following steps:
TTX-UpPCH＝TRX-DwPCH-2δtp+12＊16TC
and take integer multiples of 1/8 chips, where
TTX-UpPCHIs the starting time of UpPCH transmission according to the timing of the UE side;
TRX-DwPCHis the starting time of DwPCH receiving according to the timing of the UE side;
2δtpis the timing advance of the UpPCH;
12＊16TCis the timing advance of DwPCH over UpPCH in the frame structure, see fig. 1, 192 chips.
After the base station detects the sequence, the base station estimates the uplink synchronization timing deviation value UpPCHPOSAnd informs the UE on the downlink corresponding channel with an accuracy of 1/8 chips and a length of 11 bits, and the UE adjusts the next uplink transmission according to the value.
(3) After the uplink synchronization is established, the uplink synchronization is maintained by closed-loop timing control.
The base station performs timing estimation on the intermediate pilot frequency transmitted by the uplink UE, and issues timing adjustment signaling to the UE in an SS (synchronization Shift synchronization offset) field of a DPCH (dedicated physical Channel).
(4) And (2) when the uplink is out of step, returning to (2) to establish uplink synchronization again in an open-loop mode.
The schematic diagram of the time slot structure of TD-SCDMA is shown in fig. 2. TD-SCDMA supports multiple users in each time slot using CDMA (code division multiple access) and also supports TDMA (time division multiple access) between multiple time slots for different users. The "signal data" portion shown in fig. 2 carries DPCH data for a certain user, and the "intermediate pilot" portion corresponds to the intermediate pilot sequence for that user. The intermediate pilots must correspond to the DPCH channels.
The position of the SS field in the downlink timeslot structure in TD-SCDMA is shown in fig. 3. The TD-SCDMA specification specifies that this field occupies the position of the signal data and follows the intermediate pilot, so the SS symbol occupies a segment of the resource on the DPCH channel.
The synchronization maintaining process of TD-SCDMA and the uplink intermediate pilot frequency and downlink SS field required for maintaining synchronization can know that a precondition for maintaining uplink synchronization is as follows: for the UE, there must be dedicated physical channels DPCH in both uplink and downlink; the middle pilot frequency corresponding to the uplink DPCH is used for the measurement estimation of the channel delay by the base station, and the SS signaling carried on the downlink DPCH channel is used for indicating the synchronization adjustment of the terminal.
In current communication services, data services have shown strong demand and will dominate. Compared with the existing voice service in the communication system, the data service of internet browsing has the following different characteristics: the method has the characteristics of burstiness and the requirement of 'always on' of a user; is asymmetric in uplink and downlink; the delay time requirements are less stringent than for voice traffic, etc. Therefore, for data services, uplink and downlink dedicated physical channel resources are allocated to each UE at the same time, which is a waste of radio resources in many cases. In addition, a High Speed Downlink Packet Access (HSDPA) technical standard is being established, which uses different coding modulation schemes to improve the spectrum efficiency of a system by using a substantially constant transmission power for wireless propagation channel conditions of different UEs, and this link adaptation technique requires that as many wireless resources as possible are shared among multiple UEs and are flexibly scheduled and allocated according to the channel conditions of the UEs, instead of the form of UE-specific channels.
Therefore, the existing synchronization maintenance technical solution cannot be well applied to the optimized implementation of the packet data service in the TDD system because the existence of the uplink and downlink dedicated physical channels is required at the same time. For example, when a UE is not allocated a downlink dedicated physical channel for several frames, it may be out of synchronization due to loss of resources for maintaining synchronization from the established synchronization state accumulation. When the base station can serve the UE, it has to re-perform the synchronization establishment procedure, resulting in a waste of random access resources.
In summary, the contradiction between the dedicated physical channel resource required by the existing synchronization technology and the channel sharing and flexible scheduling required by the data service makes it difficult to implement the optimization of the communication system for data service transmission.
Disclosure of Invention
The invention aims to provide a method for realizing synchronization in a time division duplex wireless communication system, which realizes uplink synchronization maintenance after uplink synchronization is established by utilizing a downlink common pilot channel, thereby providing an uplink synchronization method for realizing data service transmission optimization in the wireless communication system.
The purpose of the invention is realized as follows: a method for realizing synchronization in a time division duplex wireless communication system comprises the following steps:
a. the user equipment establishes downlink synchronization by receiving a broadcast channel transmitted by a base station;
b. the base station determines the uplink transmitting timing adjustment quantity required by the user equipment according to the information sent by the user equipment and informs the user equipment; the user equipment carries out uplink transmission timing adjustment according to the uplink transmission timing adjustment quantity to establish uplink synchronization;
c. the user equipment carries out tracking measurement on the timing change of the downlink common pilot channel through each frame, corrects the uplink transmitting time obtained before the transmission gap by using the timing change, accumulates the correction result, and takes the result of correcting and accumulating the obtained uplink transmitting time as the current uplink transmitting time to realize the maintenance of uplink synchronization.
The step a comprises the following steps:
a1, the base station carries out broadcast transmission of data sequences known by each user equipment;
the position of the known data sequence in the frame structure is fixed, and the known data sequence periodically continuously appears on a downlink;
a2, the user equipment establishes the downlink synchronization by receiving and processing the known data sequence and receiving the downlink broadcast channel.
The step b comprises the following steps:
b1, the user equipment estimates the path loss according to the downlink received signal power and estimates the path delay according to the path loss;
b2, calculating the uplink initial transmitting time according to the path delay and transmitting an uplink detection sequence;
b3, the base station calculates the deviation between the detected uplink detection sequence time and the base station timing;
b4, using the calculated deviation as the uplink transmitting timing adjustment quantity to inform the user equipment through a downlink channel, performing uplink transmitting timing adjustment, and establishing uplink synchronization.
The step c comprises the following steps:
c1, when entering the transmission gap, the user device tracks and measures the timing change of the downlink common pilot channel in each frame, and corrects the uplink transmission time obtained before the transmission gap by using the timing change, and accumulates the correction result; after the transmission gap establishes uplink synchronization for the user equipment, each time slot without allocating special wireless resources for the user equipment;
c2, when needing to transmit uplink, using the accumulated correction result as the current uplink transmission time.
The step c1 includes:
c11, recording the uplink emission time T obtained before the transmission gapTX-UL(O)；
c12, measuring the downlink receiving time T of each frame of the downlink common pilot channel in the transmission gap time sectionRX-DL(i)；
i: the frame number mark of the transmission gap, i is more than or equal to 1 and less than or equal to the frame number in the time period of the transmission gap;
c13, calculating the change delta of the receiving time of the adjacent frame of the downlink common pilot channel in turnRX-DL(i) I.e. deltaRX-DL(i)＝TRX-DL(i)-TRX-DL(i-1) and calculating the current uplink transmission time T corresponding to the ith frame of the downlink pilot frequency in real timeTX-UL(i)，TTX-UL(i)＝TTX-UL(i-1)-δRX-DL(i)。
The step c2 includes:
c21, determining that the user equipment needs to carry out uplink transmission and is allocated with wireless communication resources;
c22, calculating the final obtained current uplink emission time T by accumulative correctionTX-UL(i) As the uplink transmission time.
The invention provides another method for realizing synchronization in a time division duplex wireless communication system, which comprises the following steps:
d. the user equipment establishes downlink synchronization by receiving a broadcast channel transmitted by a base station;
e. the base station determines the uplink transmitting timing adjustment quantity required by the user equipment according to the information sent by the user equipment and informs the user equipment; the user equipment carries out uplink transmission timing adjustment according to the uplink transmission timing adjustment quantity to establish uplink synchronization;
f: determining whether the user equipment is allocated dedicated radio resources;
g: if the user equipment is allocated with the special wireless resource, the user equipment maintains the uplink synchronization by utilizing the special wireless resource to communicate with the base station;
h: if the user equipment is not allocated with the special wireless resource, the uplink transmitting time is adjusted by measuring the timing change of the downlink common pilot channel in the wireless communication system, so as to realize the maintenance of the uplink synchronization.
The step g comprises the following steps:
g1, the user equipment transmits the uplink pilot frequency information to the base station by using the allocated special wireless resource;
g2, the base station calculates the uplink synchronization deviation by receiving and processing the uplink pilot frequency information;
g3, notifying the uplink synchronization deviation to the user equipment through the downlink dedicated radio resource of the user equipment;
g4, the user equipment carries out timing adjustment according to the received uplink synchronization deviation value, and realizes the maintenance of uplink synchronization.
The step h comprises the following steps:
h1, when entering the transmission gap, the user equipment tracks and measures the timing change of the downlink common pilot channel through each frame, corrects the uplink transmission time obtained before the transmission gap by using the timing change, and accumulates the correction result; after the transmission gap establishes uplink synchronization for the user equipment, each time slot is not allocated with the special wireless resource;
h2, when the uplink transmission is needed, taking the result of correcting and accumulating the uplink transmission time obtained before the transmission gap as the current uplink transmission time.
The content transmitted on said dedicated radio resource is intended for the single user equipment.
It can be seen from the above technical solutions that, in the technical solution of the present invention, the characteristics that the uplink and the downlink share the same frequency band in the tdd wireless communication system and the path delay time of the uplink and the downlink are the same are applied, and the uplink synchronization is no longer maintained according to the closed loop mode that the UE uploads the intermediate pilot and the base station issues the timing adjustment signaling, but the UE processes the downlink common pilot signal, and the timing adjustment is automatically made according to the timing change of the downlink common pilot, and the adjustment effect is always accumulated. When the UE has uplink sending requirement, the corresponding uplink sending timing can be adjusted according to the known uplink and downlink timing relation and the current accumulated value of the downlink timing adjustment quantity.
Therefore, the invention can keep the uplink synchronization relation at any time and recover the uplink transmission in time under the condition that the UE can not obtain the continuously allocated special physical channel which can be used for closed-loop timing adjustment. Compared with the existing TD-SCDMA synchronization maintenance scheme, the invention has the following advantages: a synchronization maintaining method is added, and the method is simpler and more reliable than the existing closed-loop synchronization maintaining method; the method does not depend on the allocation of extra allocated dedicated physical channel resources, can realize synchronous maintenance only by common resources, saves resources compared with the prior synchronous scheme, and has strong adaptability; the method is particularly suitable for a TDD system specially optimized for data service transmission.
Drawings
FIG. 1 is a schematic diagram A of a time slot structure of a TD-SCDMA system;
FIG. 2 is a schematic diagram B of a time slot structure of the TD-SCDMA system;
FIG. 3 is a schematic diagram of a time slot structure C of the TD-SCDMA system;
FIG. 4 is a flow chart of an embodiment of the present invention.
Detailed Description
The invention provides a method for synchronizing an air interface physical layer in a time division duplex wireless communication system, which is specifically realized as shown in figure 4:
step 1: for a TDD system, obtaining downlink synchronization is a prerequisite for uplink synchronization.
In TDD systems, there must be some broadcast transmission of data sequences known to the receiving end in the downlink, where the known sequences have fixed positions in the frame structure, are not known to a certain UE or UEs, but are known to UEs, and occur continuously on the downlink periodically. These known sequences are referred to as downlink common pilots in the present invention. The UE receives and processes the common pilot frequency firstly, and then receives a downlink broadcast channel, so that reliable downlink synchronization is obtained.
The step is the same as the principle process of realizing the downlink synchronization of the current TD-SCDMA system.
Step 2: after obtaining the downlink synchronization, the uplink synchronization can be established in an open-loop manner.
And the UE estimates the path delay by estimating the path loss according to the downlink received signal power, calculates the uplink initial transmission time by adopting the estimated path delay and transmits the uplink detection sequence. The base station detects the uplink sounding sequence, and informs the UE of uplink transmission timing adjustment to be performed in a downlink corresponding channel by calculating the deviation between the time when the sounding sequence is received and the timing of the base station. At this time, the UE already knows the current uplink accurate timing with the base station, regardless of whether there is data transmission on the next uplink.
The step is the same as the principle process of the current TD-SCDMA system for realizing uplink synchronization.
After the uplink and downlink synchronization is established, the uplink synchronization is maintained, and the uplink synchronization can be maintained by two processing methods according to different situations.
And step 3: judging whether special wireless resources are allocated to the user equipment, if so, executing a step 4, and adopting a closed-loop synchronization maintenance mode, otherwise, executing a step 8, and adopting a semi-blind synchronization maintenance mode;
wherein, the closed loop synchronization maintenance is the same as the uplink synchronization maintenance principle of the prior art of the TD-SCDMA system; the invention provides a semi-blind synchronization maintenance method for a new uplink synchronization maintenance method based on a TDD system.
And 4, step 4: determining that the UE needs to transmit uplink data and is allocated with a special wireless resource; when the UE occupies the part of wireless resources to transmit uplink data, using a part of resources as the transmission of information data unknown to the base station; another part of the resources is used for transmitting a data sequence of which the position and the content in the frame structure are known by the base station, and the known data sequence is called an uplink pilot;
the dedicated radio resource refers to that the content transmitted on the radio resource is specific to a single UE, rather than shared by multiple UEs;
and 5: the base station receives and processes the uplink pilot frequency to calculate and obtain the uplink synchronization deviation;
step 6: notifying the UE of the deviation via the downlink dedicated radio resource of the UE;
and 7: and the UE carries out timing adjustment of uplink transmitting time according to the received synchronous deviation amount so as to maintain uplink synchronization.
And 8: determining that the UE is not allocated to the dedicated radio resource, and entering a transmission gap time period;
the transmission gap period is: according to the result of the open-loop synchronization in the step 2, the UE already establishes the uplink synchronization, but cannot continuously perform uplink pilot frequency transmission or downlink synchronization deviation notification due to no allocated special wireless resource;
and step 9: during the transmission gap, UE tracks and measures the timing change of the downlink common pilot channel through each frame and accumulates the downlink timing change;
this step is formulated as follows:
TTX-UL(i)＝TTX-UL(i-1) a value ofRX-DL(i)
Wherein,
δRX-DL(i)＝TRX-DL(i)-TRX-DL(i-1) is a change amount, and δ is a delay amount when the change amount isRX-DL(i) Is positive, delta when the change is advanceRX-DL(i) Is a negative value;
TTX-UL(O) is an uplink reference transmission time obtained for a previous frame entering the transmission gap;
i: the frame number mark of the transmission gap, i is more than or equal to 1 and less than or equal to the frame number in the transmission gap;
TRX-DL(i) the method comprises the following steps Downlink receiving timing reference time obtained by receiving downlink common pilot frequency obtained by ith frame
Step 10: when the user equipment needs to transmit uplink data, the cumulative effect is used for correcting the uplink transmission time obtained before entering a transmission gap to obtain the current uplink transmission time;
after the uplink synchronization is established, the timing advance obtained by receiving the downlink common pilot frequency in the same time period is the timing delay of uplink transmission, and vice versa; therefore, the uplink synchronization can be maintained under the condition of lacking closed loop maintenance.
And in the synchronization maintaining process, if the uplink is detected to be out of synchronization, returning to the uplink synchronization establishing process of the step 2 again.
The semi-blind synchronization maintenance method can be used for the situation that special wireless resources for uplink and downlink are lacked and the situation that the special wireless resources for uplink and downlink are both provided, and can also be applied, namely the existing closed-loop synchronization maintenance method can be replaced, so that part of processing of uplink intermediate pilot frequency and transmitting of timing offset signaling are saved. In addition, if the UE changes from the transmission gap state to the state of reacquiring dedicated radio resources, the UE can continuously use the closed-loop synchronization maintenance method to correct the timing result of the semi-blind maintenance period.
Claims (9)
1. A method for synchronization in a time division duplex wireless communication system, comprising:
a. the user equipment establishes downlink synchronization by receiving a broadcast channel transmitted by a base station;
b. the base station determines the uplink transmitting timing adjustment quantity required by the user equipment according to the information sent by the user equipment and informs the user equipment; the user equipment carries out uplink transmission timing adjustment according to the uplink transmission timing adjustment quantity to establish uplink synchronization;
c. the user equipment carries out tracking measurement on the timing change of the downlink common pilot channel, corrects the uplink transmitting time by using the timing change, accumulates the correction result and realizes the maintenance of uplink synchronization by using the accumulated result.
2. The method of claim 1, wherein the step a comprises:
a1, the base station carries out broadcast transmission of data sequences known by each user equipment;
the position of the known data sequence in the frame structure is fixed, and the known data sequence periodically continuously appears on a downlink;
a2, the user equipment establishes the downlink synchronization by receiving and processing the known data sequence and receiving the downlink broadcast channel.
3. The method of claim 1, wherein step b comprises:
b1, the user equipment estimates the path loss according to the downlink received signal power and estimates the path delay according to the path loss;
b2, calculating the uplink initial transmitting time according to the path delay and transmitting an uplink detection sequence;
b3, the base station calculates the deviation between the detected uplink detection sequence time and the base station timing;
b4, using the calculated deviation as the uplink transmitting timing adjustment quantity to inform the user equipment through a downlink channel, performing uplink transmitting timing adjustment, and establishing uplink synchronization.
4. A method for implementing synchronization in a tdd wireless communication system according to claim 1, 2 or 3, wherein said step c comprises:
c1, when entering the transmission gap, the user device tracks and measures the timing change of the downlink common pilot channel in each frame, and corrects the uplink transmission time obtained before the transmission gap by using the timing change, and accumulates the correction result; after the transmission gap establishes uplink synchronization for the user equipment, each time slot without allocating special wireless resources for the user equipment;
c2, when needing to transmit uplink, using the accumulated correction result as the current uplink transmission time.
5. The method of claim 4, wherein the step c1 comprises:
c11, recording the uplink emission time T obtained before the transmission gapTX-UL(0)；
c12, measuring the downlink receiving time T of each frame of the downlink common pilot channel in the transmission gap time sectionRX-DL(i)；
i: the frame number mark of the transmission gap, i is more than or equal to 1 and less than or equal to the frame number in the time period of the transmission gap;
c13, calculating the change delta of the receiving time of the adjacent frame of the downlink common pilot channel in turnRX-DL(i) I.e. deltaRX-DL(i)＝TRX-DL(i)-δRX-DL(i-1) and calculating the current uplink transmission time T corresponding to the ith frame of the downlink pilot frequency in real timeTX-UL(i)，T TX-UL(i)＝TTX-UL(i-1)-δRX-DL(i)。
6. The method of claim 4, wherein the step c2 comprises:
c21, determining that the user equipment needs to carry out uplink transmission and is allocated with wireless communication resources;
c22, calculating the final obtained current uplink emission time T by accumulative correctionTX-UL(i) As the uplink transmission time.
7. A method for synchronization in a time division duplex wireless communication system, comprising:
d. the user equipment establishes downlink synchronization by receiving a broadcast channel transmitted by a base station;
e. the base station determines the uplink transmitting timing adjustment quantity required by the user equipment according to the information sent by the user equipment and informs the user equipment; the user equipment carries out uplink transmission timing adjustment according to the uplink transmission timing adjustment quantity to establish uplink synchronization;
f: determining whether the user equipment is allocated dedicated radio resources;
g: if the user equipment is allocated with the special wireless resource, the user equipment maintains the uplink synchronization by utilizing the special wireless resource to communicate with the base station;
h: if the user equipment is not allocated with the special wireless resource, the uplink transmitting time is adjusted by measuring the timing change of the downlink common pilot channel in the wireless communication system, so as to realize the maintenance of the uplink synchronization.
8. The method for implementing synchronization in a time division duplex wireless communication system according to claim 7, wherein the step g comprises:
g1, the user equipment transmits the uplink pilot frequency information to the base station by using the allocated special wireless resource;
g2, the base station calculates the uplink synchronization deviation by receiving and processing the uplink pilot frequency information;
g3, notifying the uplink synchronization deviation to the user equipment through the downlink dedicated radio resource of the user equipment;
g4, the user equipment carries out timing adjustment according to the received uplink synchronization deviation value, and realizes the maintenance of uplink synchronization.
9. The method of claim 8, wherein the content transmitted on the dedicated radio resource is for the single UE.
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| CN102843761A (en) * | 2011-06-21 | 2012-12-26 | 中兴通讯股份有限公司 | Multi-carrier terminal in-sync regulating and out-of-sync judging method and corresponding devices and systems |
| CN103582109B (en) * | 2012-07-23 | 2016-09-07 | 京信通信系统（中国）有限公司 | A kind of method for synchronizing time and device |
| CN103716872B (en) * | 2012-10-09 | 2017-11-10 | 中兴通讯股份有限公司 | Uplink synchronous method of adjustment and device in TDD system |
| CN107850631B (en) | 2015-04-03 | 2020-06-26 | 大力系统有限公司 | Method and system for link synchronization in LTE-TDD architectures |
| CN107682074B (en) * | 2017-11-08 | 2024-03-29 | 南京天际易达通信技术有限公司 | Satellite uplink signal transmitting time compensation method, device and communication system |
| US20240098667A1 (en) * | 2020-11-30 | 2024-03-21 | Beijing Xiaomi Mobile Software Co., Ltd. | Timing adjustment method and apparatus, communication device, and storage medium |
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| US5809397A (en) * | 1996-02-29 | 1998-09-15 | Motorola, Inc. | Method and apparatus for system synchronization in a messaging system |
| JP2001257641A (en) * | 2000-02-11 | 2001-09-21 | Lucent Technol Inc | Uplink timing synchronization and access control for multi-access wireless communication system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5809397A (en) * | 1996-02-29 | 1998-09-15 | Motorola, Inc. | Method and apparatus for system synchronization in a messaging system |
| JP2001257641A (en) * | 2000-02-11 | 2001-09-21 | Lucent Technol Inc | Uplink timing synchronization and access control for multi-access wireless communication system |
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