Abstract:
A method for supporting broadcast transmissions and unicast communications in a wireless communication system is described. The method comprises supporting unicast communication in a first mode of operation wherein at least one unicast data transmission unit is encoded and communicated within a time-continuous sub-frame of a first length and a first number of timeslots. The method further comprises supporting broadcast transmission in a second mode of operation, wherein at least one broadcast data transmission unit is encoded communicated over a time period that comprises a discontinuous plurality of the time-continuous sub-frames of the first length.
Abstract:
An efficient scheme for CDMA coding constructs codes by generating longer code sequences (430) via concatenation, from an existing set of short sequences (410, 420). The sequences may be spreading, scrambling and or training or channel estimation (such as midamble) sequences. The invention allows extension of sequences without performing an exhaustive search for sequences with optimal desired properties, as well as extension of the sequence duration to improve the detection of wanted signals via the use of a conventional matched filter, a multi-user detector or an adaptive filter/equaliser.
Abstract:
Aspects of the invention include a root node of a wireless communication infrastructure that buffers data packets for transmission by base stations over an air interface. The root node determines a time delay for transmission of a data packet from the root node to each base station, a maximum time delay of those time delays, and a timing latency based upon the maximum time delay. The root node transmits the timing latency to the base stations. In response, each base station initiates transmission of data packets received by the root node after expiration of the timing latency. Alternatively, the root node, instead of the base stations, may buffer the data packets, and transmit them so that they arrive at the base stations at substantially the same time.
Abstract:
A multi-user detector (200) and method (300) for use in a cellular CDMA system (100) based on: estimating (210) spare code resource available in a first cell of the system; selecting (220) at least a second cell neighbouring the first cell; selecting (230) from codes associated with the second cell at least one additional code; and performing (240) multi-user detection processing in the first cell with the at least one additional code. On the downlink, codes from other users in the same cell may be treated with the same level of priority as those of users from neighbour cells, codes allocated to the UE having the highest priority; on the uplink, codes of all users in the same cell may have the same priority which is higher than that of neighbour cell users. This provides the advantage(s) that multi-user detector capacity arising from operating under high interference conditions is employed to accommodate users from neighbour cells, with the result that both intracell and intercell interference may be mitigated.
Abstract:
Processing of a received code division multiple access, CDMA, burst (405) when a spreading factor of the CDMA burst (405) has been changed from an allocated spreading factor (SF0) to a new spreading factor (SFn). The received burst (405) is processed with a CDMA detector (310), using the allocated spreading factor (SF0), to provide a CDMA detector output; the new spreading factor (SFn) of the burst is determined; and the CDMA detector output is decimated by a factor determined from the new spreading factor (SFn). The decimator may be a FIR decimator (315) and tap weights may be determined using the values of the new spreading factor (SFn) and the allocated spreading factor (SF0). Application in a Node B (150A) of a UMTS system (100), particularly in UTRA TDD mode, for processing received uplink communication is described.
Abstract translation:当CDMA突发(405)的扩频因子已经从分配的扩频因子(SF <0> 0)改变到新的扩频因子时,对接收的码分多址,CDMA,突发(405)进行处理 (SF N)。 使用所分配的扩频因子(SF <0> 0),用CDMA检测器(310)处理所接收的突发(405),以提供CDMA检测器的输出; 确定突发的新扩频因子(SF N SUB>); 并且CDMA检测器输出被从新的扩展因子(SF N n N)确定的因子抽取。 抽取器可以是FIR抽取器(315),并且抽头权重可以使用新的扩展因子(SF N n N)和所分配的扩展因子(SF&lt; N&gt; )。 描述了在UMTS系统(100)的节点B(150A)中的应用,特别是在UTRA TDD模式中用于处理接收到的上行链路通信的应用。
Abstract:
A cellular communication system Multiple-In Multiple-Out, MIMO, transmitter includes a plurality of antennas, a selector that selects training sequences for messages, a generator that generates messages including selected training sequences, and a transmitter that transmits the messages on the plurality of antennas. The selector selects a training sequence for a message from a set of training sequences in response to an associated antenna on which the message is to be transmitted. The set of training sequences is associated with a cell of the MIMO transmitter and includes disjoint subsets of training sequences for each of the plurality of antennas.
Abstract:
A cellular communication system comprises a Multiple-In Multiple-Out, MIMO, transmitter (101) and receiver (103). The MIMO transmitter (101) comprises a message generator (303) for generating MIMO messages comprising selected training sequences and transceivers (305, 307, 309) transmitting the messages on a plurality of antennas (311, 313, 315). The training sequences are selected by a midamble selector (317) from a set of training sequences in response to an associated antenna on which the message is to be transmitted. The set of training sequences is associated with the cell of the MIMO transmitter and comprises disjoint subsets of training sequences for each of the plurality of antennas. The receiver (103) comprises a transmit antenna detector (419) which determines which antenna of the MIMO transmitter the message is transmitted from in response to the training sequence of the received message.
Abstract:
A method (400) and arrangement (200) for mitigation of intercell and intracell interference in a 3GPP cellular communication system (100) by, in a receiver in a cell of the system, deriving for a first channel in the cell a signal, representative of first channel transfer function (A(1)); deriving for at least a second channel originating in a different cell a signal (A(2 . . . M)), representative of second channel transfer function, based on: deriving a cell specific scrambling code (s), deriving a channel impulse response (h), and deriving a channelisation code (c); and performing multi-user detection using the first and second signals. Where the channelisation code is unknown, a substitute channelisation code is preferably substituted. It will be appreciated that the technique can be applied to both downlink and uplink. This provides the advantage that both intra-cell interference and intercell interference are mitigated.
Abstract:
Aspects of the invention include a root node of a wireless communication infrastructure that buffers data packets for transmission by base stations over an air interface. The root node determines a time delay for transmission of a data packet from the root node to each base station, a maximum time delay of those time delays, and a timing latency based upon the maximum time delay. The root node transmits the timing latency to the base stations. In response, each base station initiates transmission of data packets received by the root node after expiration of the timing latency. Alternatively, the root node, instead of the base stations, may buffer the data packets, and transmit them so that they arrive at the base stations at substantially the same time.
Abstract:
An encoder and method for efficient synchronization channel encoding in UTRA TDD mode by: producing a codeword a, where a=dG+z modulo-2, where d represents a predetermined code group to be encoded, G represents a predetermined generator matrix, and z represents a function of the code group number and a row of the generator matrix; producing values sk=2a2k+1+ak;k=0, 1, 2, 3, and associated values b0,b1,b2; and producing a value Sssc associated with the code group, where Sssc=(b0cπ(0),b1cπ(1),b2cπ(2)), cπ represents a code within the code group, and b0,b1,b2ε(±1,±j). This provides an efficient encoding architecture for the synchronization channel in UTRA TDD mode; and, in addition, by simple manipulation of the generation matrix, a higher chip rate signal may be signalled while still preserving the signalling information for the lower chip rate.
Abstract translation:一种用于在UTRA TDD模式中有效同步信道编码的编码器和方法,其通过以下步骤:产生码字a,其中a = dG + z modulo-2,其中d表示要编码的预定码组,G表示预定的生成矩阵,z表示z 表示代码组编号和生成矩阵行的函数; k = 0,1,2,3,以及相关联的值b pi SUB>表示代码组内的代码,并且b&lt; 0&gt;,b&lt; 1&gt;,2&lt; 2&epsiv; ±j)。 这为UTRA TDD模式中的同步信道提供了有效的编码架构; 另外,通过对生成矩阵的简单操作,可以发信号通知较高的码片速率信号,同时仍然保留较低码片速率的信令信息。