WO2009021405A1 - Procédé, système et appareil pour l'accès duplex à répartition dans le temps (tdd) aléatoire - Google Patents

Procédé, système et appareil pour l'accès duplex à répartition dans le temps (tdd) aléatoire Download PDF

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Publication number
WO2009021405A1
WO2009021405A1 PCT/CN2008/001461 CN2008001461W WO2009021405A1 WO 2009021405 A1 WO2009021405 A1 WO 2009021405A1 CN 2008001461 W CN2008001461 W CN 2008001461W WO 2009021405 A1 WO2009021405 A1 WO 2009021405A1
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Prior art keywords
random access
preamble sequence
access channel
base station
length
Prior art date
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PCT/CN2008/001461
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English (en)
Chinese (zh)
Inventor
Hai Tang
Shiqiang Suo
Libo Wang
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Datang Mobile Communications Equipment Co., Ltd.
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Publication date
Application filed by Datang Mobile Communications Equipment Co., Ltd. filed Critical Datang Mobile Communications Equipment Co., Ltd.
Publication of WO2009021405A1 publication Critical patent/WO2009021405A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • Time division duplex random access method system and device thereof
  • the present invention relates to the field of mobile communication technologies, and in particular, to an Orthogonal Frequency Division Multiplexing (OFDM) based Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) evolution system.
  • OFDM Orthogonal Frequency Division Multiplexing
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • the random access technology more particularly relates to a time division duplex random access method, system and device thereof for medium coverage and large coverage systems. Background technique
  • TD-SCDMA is the only three-dimensional international standard for third-generation mobile communication systems that adopts Time Division Duplex (TDD), which supports international standards for uplink and downlink asymmetric service transmission, and has greater flexibility in spectrum utilization.
  • TDD Time Division Duplex
  • the system uses advanced technologies in wireless communication such as smart antenna, uplink synchronization, joint detection and software radio to make the system have higher performance and spectrum utilization.
  • smart antenna with the development of society and the advancement of technology, people's requirements for mobile communication are also increasing. It is hoped that the system can provide high-capacity, high-rate, low-latency data transmission services.
  • TD-SCDMA systems also need to evolve and improve performance.
  • a broadband time division duplex cellular system In the evolution scheme of TD-SCDMA, in order to obtain a high-speed and large-capacity service, it is required to occupy a wider bandwidth, so it is called a broadband time division duplex cellular system.
  • the radius of the cell to be covered can be divided into three levels, namely 5 km, 30 km and 100 km. For a 100km system, it is usually called a large coverage system, a 30km system is called a medium coverage system, and a 5km system is called a small coverage system.
  • the asynchronous random access preamble sequence of the broadband time division duplex cellular system is used for uplink clock synchronization and UE identifier detection.
  • the preamble sequence is immediately adjacent to the uplink and downlink transition point, and the uplink and downlink transition time at this time corresponds to the uplink and downlink protection of the cell radius, so the signal of the neighboring cell base station It is likely to interfere with the random access preamble sequence of the cell.
  • the data slot of the cell after the uplink and downlink guard interval may also be interfered, but for the data channel, interference to the data channel may be avoided by scheduling or using other interference avoidance or cancellation methods.
  • FIG. 1( a ) is a frame structure of an original TD-SCDMA evolved system in a prior art broadband time division duplex cellular system
  • FIG. 1 ( b ) is a frame structure in a large coverage case of a prior art broadband time division duplex cellular system.
  • the time slot TS0 is fixed as a downlink time slot
  • the DwPTS is a downlink pilot time slot
  • the GP is an uplink and downlink guard interval
  • the UpPTS is an uplink pilot time slot.
  • the indication marked with ⁇ is the uplink time slot
  • the indication marked with ⁇ is the downlink time slot
  • the dotted line between TS4 and TS6 or TSx indicates the omitting
  • the intermediate time slot is not shown.
  • TSx represents the Xth time slot. Since it is an uplink or downlink time slot, the uplink and downlink attributes are not marked in the figure.
  • the ⁇ 4 machine access channel occupies resources in the frequency domain and cannot be represented by the UpPTS time slot as in the small coverage system. Therefore, in the large coverage system of Figure 1 (b), the previous synchronization The code sequence is used to identify.
  • the random access preamble sequence is allocated next to the GP, wherein the length of the GP corresponds to twice the radius of the cell, that is, the time elapsed by the photospeed corresponding to the cell radius distance of 2 times.
  • the preamble sequence needs to be extended accordingly.
  • the random access preamble sequence arrives at the local cell together with the TS0 time slot or the DwPTS time slot signal of the remote cell.
  • the base station that is, the random access preamble sequence of the local cell is interfered by the TS0 time slot and the DwPTS time slot signal of the remote cell, for example, the first layer cell outside the local cell.
  • the uplink data slots of the UE in the cell such as TS2 and TS3 are also interfered by the remote cell TS0 slot and the DwPTS slot, but because the data is transmitted, the specific data transmission can pass through the base station.
  • the remote cell TS0 time slot and DwPTS time slot signal interference have a great influence on the preamble sequence. These interferences can reduce the reception quality of the preamble sequence by the base station of the cell, and the success rate of the random access detection is reduced.
  • the UE After the UE sends the preamble sequence for random access, it will perform reception detection on the corresponding channel during the feedback time of the waiting base station to see if there is any access back from the base station. Successful instructions.
  • the performance of the base station detecting the preamble sequence is degraded, so that the preamble sequence cannot be correctly detected. If the base station cannot correctly detect the preamble sequence, the base station does not send feedback information to the UE.
  • the UE If the UE does not detect the feedback signal on the corresponding feedback channel, the UE will wait until the preset waiting time expires, and the UE will re-initiate another random access. Due to the last random access detection, many UEs do not receive the correct feedback information, so more UEs will send a preamble sequence to the base station at the next moment, causing the base station to detect the performance of multiple preamble sequences. Further decline.
  • one of the objects of the present invention is to solve the technical problem of the interference of the downlink time slot of the remote cell to the random access preamble.
  • an aspect of the present invention provides a time division duplex random access method, including the following steps: a base station broadcasts location information of a random access channel and an optional preamble sequence through a broadcast channel, where The length of the random access channel is greater than the length of the preamble sequence; the base station receives the preamble sequence selected by the UE sent by the terminal UE through the random access channel, and the random access channel includes at least a blank area, as a guard interval of the preamble sequence selected by the UE; the base station performs random access detection on the UE according to the preamble sequence sent by the UE.
  • the location information of the random access channel is determined by: configuring a length of the random access channel according to a coverage of the base station and a length of an optional preamble sequence, The length of the random access channel is an integer multiple of the length of the uplink time slot; determining the location of the random access channel according to the uplink time slot scheduled by the base station and the length of the random access channel, so that the random access The access channel is located in an uplink time slot that is far from the uplink and downlink guard interval.
  • the guard interval is located after the preamble sequence, immediately adjacent to the preamble sequence.
  • the sum of the guard interval, the preamble sequence, and the length of the cyclic prefix is equal to the length of the random access channel.
  • the guard interval length ranges from greater than zero to less than or equal to 2 times the speed of light corresponding to the cell radius distance.
  • the method before the base station broadcasts the location information of the random access channel and the selectable preamble sequence through the broadcast channel, the method further includes: grouping the preamble sequence according to the channel transmission quality. And the UE selects the preamble sequence after the group according to the current downlink channel quality.
  • the random access preamble sequence is a directly generated long synchronization code sequence, or is formed by repeating a short synchronization code sequence.
  • the synchronization code sequence is a Zadoff-Chu sequence, a GCL sequence, a Golay sequence or a Barker sequence.
  • Another aspect of the present invention further provides a time division duplex random access method, comprising the steps of: receiving, by a UE, location information of a random access channel broadcast by a base station and an optional preamble sequence, where the random access channel The length is greater than the length of the preamble sequence; the UE randomly selects a preamble sequence in the selectable preamble sequence to send to the base station through a random access channel, the random access
  • the channel includes at least one blank area as a guard interval of the preamble sequence selected by the UE.
  • the UE detects the response channel of the base station, and obtains a result of the base station detecting the random access of the UE.
  • the location information of the random access channel is determined by: configuring a length of the random access channel according to a coverage of the base station and a length of an optional preamble sequence, The length of the random access channel is an integer multiple of the length of the uplink time slot; determining the location of the random access channel according to the uplink time slot scheduled by the base station and the length of the random access channel, so that the random access The access channel is located in an uplink time slot that is far from the uplink and downlink guard interval.
  • the guard interval is located after the preamble sequence, immediately adjacent to the preamble sequence, and the sum of the guard interval, the preamble sequence, and the length of the cyclic prefix is equal to the The length of the random access channel.
  • the guard interval length ranges from greater than zero to less than or equal to 2 times the distance traveled by the aperture distance.
  • the UE randomly selects one preamble sequence in the optional preamble sequence, where the UE is: according to the current downlink channel quality, the preamble sequence. Column to make a selection.
  • the random access preamble sequence is a directly generated long synchronization code sequence, or is formed by repeating a short synchronization code sequence.
  • the synchronization code sequence is a Zadoff-Chu sequence, a GCL sequence, a Golay sequence or a Barker sequence.
  • a further aspect of the present invention further provides a random access channel, where the length of the random access channel is greater than the length of the preamble sequence, and the random access channel includes at least one blank area as a UE to the base station.
  • the guard interval of the transmitted preamble sequence is not limited to the length of the preamble sequence.
  • the length of the random access channel is an integer multiple of the length of the uplink time slot.
  • the guard interval is located after the preamble sequence, immediately adjacent to the preamble sequence, and the sum of the guard interval, the preamble sequence, and the length of the cyclic prefix is equal to The length of the random access channel.
  • the guard interval length ranges from greater than zero to less than or equal to the time elapsed for the optical speed corresponding to the cell radius distance.
  • a further aspect of the present invention further provides a UE, comprising: a sequence selection module, configured to select a preamble sequence in the base station broadcast information; and a random access channel forming module, configured to use the broadcast information and the selected The preamble sequence forms a random access channel; the sending module is configured to send the preamble sequence to the base station of the cell by using a random access channel, where the random access channel further includes a blank area as the preamble sequence
  • the protection interval of the base station is used to detect the response channel of the base station to determine whether the access is successful.
  • the preamble sequence and the guard interval are located in an uplink slot that is away from the uplink and downlink guard interval.
  • the length of the random access channel is an integer multiple of the length of the uplink time slot.
  • a further aspect of the present invention provides a base station, including: a broadcast module, configured to broadcast location information of a random access channel and a preamble sequence usable by the current cell through a broadcast channel; and a random access sequence detecting module, And a preamble sequence for detecting a random access channel, where the random access channel further includes a blank area as a guard interval of the preamble sequence; a random access response mode a block, configured to respond to the detected preamble sequence by a response channel.
  • an uplink time slot setting module is further configured to configure an uplink time slot according to a coverage area and a time slot width occupied by the preamble sequence and the guard interval.
  • a preamble sequence grouping module is further included for grouping according to a grouping condition corresponding to each preamble sequence.
  • the present invention also provides a time division duplex random access system, comprising: a base station and at least one UE served by the base station, the base station comprising: a broadcast module, configured to use location information of the random access channel and the local cell to be used
  • the preamble sequence is broadcasted through a broadcast channel;
  • a random access sequence detection module is configured to detect a preamble sequence sent by the UE in the random access channel;
  • a random access response module is configured to detect the preamble through the response channel pair
  • the synchronization code sequence is responsive;
  • the UE includes: a sequence selection module, configured to select a preamble sequence in the base station broadcast information, and a random access channel formation module, configured to use the broadcast information and the selected preamble
  • the code sequence forms a random access channel;
  • the sending module is configured to send the preamble sequence to the cell base station by using a random access channel, where the random access channel further includes a blank area as a guard interval of the preamble sequence a
  • the preamble sequence and the guard interval are located in an uplink slot that is away from the uplink and downlink guard interval.
  • the present invention is directed to a broadband time division duplex cellular system.
  • the proposed random access channel design scheme with guard interval does not require the preamble sequence to be close to the uplink and downlink protection interval, so that the random access channel is The allocation is more flexible.
  • the present invention places the preamble sequence with the guard interval as far as possible from the uplink time slot position of the uplink and downlink guard interval, so that the interference of the remote base station can be avoided as much as possible according to the allocation criterion of the random access channel, and the base station of the base station is guaranteed. Correct detection of the random access channel can achieve accurate and fast random access of the UE, and provides an effective solution for the OFDM system to achieve random access of the UE.
  • 1(a) is a design diagram of a frame structure of a prior art original TD-SCDMA evolution system and a random access UpPTS;
  • FIG. 1(b) is a frame structure of a prior art TD-SCDMA evolution system in a case of large coverage
  • FIG. 2 is a Preamble sequence structure following a guard interval according to an embodiment of the present invention
  • FIG. 3 ( a ) is a diagram of a random access channel location allocation in a case of a small coverage of 5 km according to an embodiment of the present invention
  • FIG. 3(b) is a diagram showing a random access channel position allocation in a case of coverage of 30 km according to an embodiment of the present invention
  • FIG. 3(c) is a diagram showing a location allocation of a random access channel in a case of a large coverage of 100 km according to an embodiment of the present invention
  • 4(a) is a diagram showing a random access channel location allocation in the case where TS4 is a small coverage of 5 km downlink time slot according to an embodiment of the present invention
  • 4(b) is a diagram showing a random access channel location allocation in the case where the TS4 is a coverage of a downlink time slot of 30 km according to an embodiment of the present invention
  • 4(c) is a diagram showing a random access channel location allocation diagram in the case where TS4 is a 100 mL large coverage of a downlink time slot according to an embodiment of the present invention
  • FIG. 5 is a sequence diagram of a random access procedure between a UE and a base station according to an embodiment of the present invention
  • FIG. 6 is a block diagram of a random access part of a UE and a base station according to an embodiment of the present invention. detailed description
  • the main idea of the present invention is to redesign the random access channel structure, and in the case that uplink channel allocation is possible, the redesigned random access channel can be flexibly configured in the uplink channel, and the cell is randomly connected.
  • the sending position of the preamble sequence is far away from the time when the TS0 time slot and the DwPTS time slot of the remote base station reach the local cell, and the interference of the downlink time slot of the remote base station to the preamble sequence of the current cell is reduced as much as possible, thereby improving the detection of the random access channel. Success rate and access speed of the UE.
  • the present invention includes a blank area in the random access channel that does not transmit any data, and the guard interval (GT) as a preamble sequence in the blank area is used to eliminate the time due to the preamble sequence.
  • the guard interval As shown in Figure 2.
  • a guard interval is set in the random access channel, but those skilled in the art should understand that setting multiple guard intervals, such as setting a protection before and after. Intervals, as well as the objects of the invention, are also encompassed by the scope of the invention.
  • the sum of the guard interval GT, the preamble sequence, and the cyclic prefix CP is equal to the length of the random access channel.
  • the random access channel is not necessarily limited to the GP to allocate, because the preamble sequence in the random access channel allocation structure has its own guard interval, which can avoid the preamble sequence forward. Or when moving backwards, it interferes with the data slots before and after.
  • the range of values of the GT is theoretically greater than zero, and is less than or equal to the time required for the speed of light to travel twice the radius of the cell.
  • the value of the GT in the present invention is configurable, and in the case that the base station receives the signal to noise ratio, the base station antenna coverage distance may be determined by the base station antenna.
  • the UE estimates a timing advance when transmitting the preamble sequence such that the preamble sequence it transmits can reach the base station at its target time. As shown in Figure 3 (b), the target moment of the preamble sequence should be at the beginning of the TS3 slot. If a UE is at the cell edge, the UE needs to advance GT/2 time when transmitting the preamble sequence, which sends the preamble sequence. The cell base station will arrive at the start position of the TS3 slot, so that the preamble sequence will not affect the data slots before and after due to the guard interval.
  • the Preamble sequence can be placed as far as possible from the GP, which needs to be specifically set according to the number and location of uplink time slots scheduled by the base station, such as placing the random access preamble sequence in TS3 and The TS4 slot position, or the random access preamble sequence can be placed in the TS5 and TS6 slot positions, or even further slot positions.
  • the Preamble sequence can occupy more than two time slots, and the number of specific occupied slots will be described in detail in the following description. Therefore, it can be seen that the setting of the random access channel is different due to the specific conditions of the uplink time slot scheduled by the base station, and the structure of the random access channel may have multiple modes.
  • the following random access channels of the present invention are shown in FIG. 3 and FIG. The examples are only for the purpose of facilitating the understanding of the present invention, and it is not intended that the present invention can be realized only by the examples described below.
  • the random access preamble sequence can be placed in the TS3 and TS4 time slot positions.
  • the preamble sequence is placed at the TS3 and TS4 slot positions, so that the transmission position of the random access preamble sequence is far away from the time when the remote base station TS0 slot and the DwPTS slot reach the local cell, thereby avoiding the remote base station TS0 slot and DwPTS slot. Interference with the preamble sequence of the cell.
  • Figure 4 (c) and Figure 4 (c) show the comparison of the location allocation scheme of the random access preamble sequence with the small coverage and large coverage
  • TS4 is the downlink time slot
  • Figure 4 (b) shows the medium coverage
  • TS3 is a random access preamble sequence location allocation scheme for downlink time slots.
  • the random access preamble sequence can only be allocated in the TS1 and TS2 slot positions.
  • the random access preamble sequence can only be allocated in the TS2 and TS3 slot positions.
  • the preamble sequence does not occupy the GP time, and the interference of the remote base stations TS0 and DwPTS is small.
  • this structure can be mainly applied to cells in which TS0 and DwPTS interference is not very large.
  • the allocation criterion in the random access channel of the medium coverage and the large coverage system is: when there is enough uplink channel, according to the interference situation Random access preamble sequence location allocation.
  • the random access preamble sequence and its guard interval are allocated as far as possible to the uplink time slot position away from the uplink and downlink guard interval.
  • the interference of the remote base station can be avoided.
  • the interference of the TS0 and the DwPTS of a specific cell may be measured when the cell is initially set, and the random access channel may be allocated according to the measured value, without dynamic measurement, and dynamic measurement It is also complicated and difficult to measure.
  • the lengths of the random access preamble sequences with guard intervals given in FIG. 3 and FIG. 4 are both corresponding to the length of two time slots.
  • the random access preamble sequence and the GT may be longer, It is the length of N time slots. which is
  • Length represents a function of the length of time.
  • N is an integer greater than or equal to 1, that is, the length of the preamble and GT can be placed in one time slot.
  • N can only be taken.
  • preamble sequence and GT protection The sum of the occupied durations of the intervals is equal to an integer multiple of one slot in TD-SCDMA.
  • the allocation criterion of the random access preamble sequence with guard interval according to the present invention in the random access channel is applicable to the random access preamble sequence of any length.
  • the following method may be used to generate a long preamble sequence of a large-area cell:
  • A. Directly generate a long preamble sequence.
  • the advantage of this method is that the number of sequences that can be used is large, but the complexity of generating long preamble sequences is relatively high, and implementation is difficult;
  • the shorter length preamble sequence is repeated to form a long preamble sequence.
  • the advantage of this method is that while providing a sufficient number of sequences, it can avoid the high complexity of directly generating long sequences, and can improve the detection performance to some extent.
  • the selection of a specific preamble sequence in the present invention may select a Zadoff-Chu sequence, a GCL sequence, a Golay sequence, or a Barker sequence having good autocorrelation and cross-correlation properties.
  • FIG. 5 is a timing sequence diagram of a random access procedure between a UE and a base station. According to the time sequence of signal transmission, the entire random access procedure can be divided into four steps, which are described in detail below:
  • Step 1 The base station broadcasts the location information of the random access channel and all preamble sequence identifiers that can be used by the cell through the broadcast channel.
  • the number of uplink time slots allocated by the base station is also limited. Different from the prior art, with the technical solution disclosed by the present invention, the number of uplink time slots at this time needs to meet the requirement of sending a random access channel length. For medium coverage, the base station must allocate at least one uplink time slot. If the random access channel occupies the length of two uplink time slots, then the base station needs to allocate at least two uplink time slots; for large coverage, the base station at least Two uplink time slots are to be allocated, otherwise the random access channel cannot be allocated.
  • the base station After allocating the number of uplink time slots according to the length of the random access channel and the uplink data volume requirement of the system, the base station allocates the number of random access channels according to the estimated number of initiated random access users in the current cell. After determining the length of the random access channel, the location of the random access channel may be determined according to the uplink time slot and the length of the random access channel scheduled by the base station, so that the random access channel is located in an uplink time slot that is far away from the uplink and downlink protection interval. in. As shown in FIG. 3, the length of the random access channel can be set to two TSs, and when the TS4 is an uplink time slot, the random access channel is set on TS3 and TS4; and in FIG. 4, the same random access channel is used.
  • the length is set to two TSs, however, since TS4 is a downlink time slot, only random access channels can be set on TS2 and TS3. Of course, this is only for the convenience of understanding the case.
  • the setting of the random access channel may be different according to the scheduling of the base station. However, according to the main idea of the present invention, the protection interval in the random access channel should be protected by the invention. Covered by the scope. Finally, the base station broadcasts the location information of the random access channel and the preamble sequence used by the local cell through the broadcast channel.
  • the number of preamble sequences that can be used by a cell is planned in the cell planning. If the number of planning is 16, the cell base station broadcasts all available preamble sequences when broadcasting downwards. The UE randomly chooses itself.
  • all available preamble sequences are grouped, for example, 16 sequences are divided into two groups, namely, group 1 and group 2, then select The sequence in packet 1 implies that the downlink channel quality is better; if the selected sequence is located in packet 2, the downlink channel quality is implied.
  • the conditions for grouping may include other parameters in addition to the downlink channel quality described above.
  • Step 2 randomly select a preamble sequence from all preamble sequences, and send the selected preamble sequence to the base station on the random access channel according to the location information of the random access channel provided by the base station.
  • the UE randomly selects a preamble sequence from the optional preamble sequence group according to the broadcast information of the base station according to the current implicit information transmitted by the preamble sequence, and then arbitrarily selects one channel among all the random access channels, and sends the Preamble sequence.
  • the transmission timing advance of this preamble is determined according to the timing advance algorithm. Since the GT is placed after the preamble, it is necessary to subtract a constant from the time advance, ie GT/2, so that the preamble can be within the random access channel range without disturbing the data slots before and after.
  • Step 3 The base station performs preamble sequence detection on the allocated random access channel location.
  • the detection is correlation detection, and the base station responds to the detected preamble sequence, and the response channel is a fixed channel.
  • the response information of the base station includes the preamble sequence of the response, the timing advance information, and the like, and may also include resource allocation information corresponding to the preamble sequence.
  • the resource allocation information may also be default, that is, not sent.
  • Step 4 The UE detects the base station response channel within a fixed length of time, if When the preamble sequence sent by itself is detected, the UE considers that it has been detected by the base station. Then, the UE sends data on the uplink resource corresponding to the preamble.
  • FIG. 6 is a structural diagram of a time division duplex random access system according to an embodiment of the present invention, the system including a base station and at least one UE served by the base station.
  • the base station includes: a broadcast module, a random access sequence detection module, a random access response module, an uplink time slot setting module, and a preamble sequence grouping module.
  • a broadcast module configured to broadcast the location information of the random access channel and the preamble sequence usable by the local cell through the broadcast channel.
  • the random access sequence detecting module is configured to detect a preamble sequence in the random access channel, where the preamble sequence carries its own guard interval.
  • the random access response module is configured to respond to the detected preamble sequence through the response channel.
  • An uplink time slot setting module configured to configure an uplink time slot according to a coverage area and a time slot width occupied by the preamble sequence and the guard interval, wherein the purpose of the module is that the number of uplink time slots must meet the length of the random access channel.
  • the requirements can be set at system initialization.
  • the preamble sequence grouping module is configured to group the preamble sequence according to a packet condition corresponding to each preamble sequence, a channel quality, and the like.
  • the packet itself identifies information about the packet conditions to the client, and the client can perform the appropriate action based on the implicit information contained in the packet.
  • the UE includes: a sequence selection module, a random access channel forming module, a sending module, and a base station response detecting module.
  • a sequence selection module is configured to select a preamble sequence in the base station broadcast information.
  • a random access channel forming module configured to form a random access channel according to the cell broadcast information and the selected preamble sequence, where the preamble sequence in the formed random access channel carries its own guard interval, and the preamble sequence And its guard interval is located at the location of the upstream slot in the TD-SCDMA frame.
  • a sending module configured to send the preamble sequence to the cell base station by using a random access channel.
  • the base station response detecting module is configured to detect the base station response channel to determine whether the access is successful.
  • the invention improves the structure of the random access channel, and in combination with the allocation criterion of the random access channel disclosed by the present invention, the interference of the remote cell TS0 time slot and the DwPTS time slot to the random access process can be avoided as much as possible.
  • the impact of the UE thus achieving accurate and fast random access of the UE, improves the operational efficiency of the entire communication system.

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Abstract

La présente invention concerne un procédé d'affectation pour un canal d'accès aléatoire de systèmes d'échelle moyenne et de grande échelle dans un système évolutif TD-SCDMA, et la séquence de préambule peut être affectée aux intervalles de liaison montante très espacés de la période de garde (GP) par l'ajout de période de garde à la séquence de préambule d'accès aléatoire en présence d'une grande interférence. L'invention peut résoudre le problème d'interférence produite par les intervalles temporels TSO et DwPTS de cellules distantes à la séquence de préambule d'accès aléatoire de la cellule courante. L'affectation du canal d'accès aléatoire devient plus flexible et la probabilité de détection réussie de la séquence de préambule par la station de base est améliorée grâce à l'invention.
PCT/CN2008/001461 2007-08-13 2008-08-13 Procédé, système et appareil pour l'accès duplex à répartition dans le temps (tdd) aléatoire WO2009021405A1 (fr)

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