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    • 11. 发明申请
    • METHOD, USER EQUIPMENT AND RADIO BASE STATION FOR RANDOM ACCESS IN A CELLULAR TELECOMMUNICATIONS SYSTEM
    • 蜂窝电信系统中随机接入的方法,用户设备和无线电台站
    • WO2007117186A1
    • 2007-10-18
    • PCT/SE2006/050064
    • 2006-04-07
    • TELEFONAKTIEBOLAGET LM ERICSSON (publ)DAHLMAN, ErikHAARTSEN, Jacobus
    • DAHLMAN, ErikHAARTSEN, Jacobus
    • H04Q7/38
    • H04W56/0045H04W56/00H04W74/0891
    • The present invention relates to a random access process in a cellular communications system and to a user equipment (UE) and a NodeB adapted for performing the process. A problem with the random access is that the time slot for receiving a random access request (RA-request) has a long unused guard portion. When the UE transmits the RA-request, the distance to the receiving NodeB is unknown, and the purpose of the guard portion is to accommodate for propagation delay. The disadvantage is the inefficient use of the random access channel which results in long delays for UEs to access the network. The present invention solves the problem with a method in which the UE position is determined and the distance and propagation delay between the UE and NodeB is calculated before the transmission of the RA-request, and the timing of the transmission is advanced by the propagation delay.
    • 本发明涉及蜂窝通信系统中的随机接入过程以及适于执行该过程的用户设备(UE)和节点B. 随机访问的问题在于,用于接收随机访问请求(RA请求)的时隙具有长的未使用的保护部分。 当UE发送RA请求时,到接收节点B的距离是未知的,并且保护部分的目的是适应传播延迟。 缺点是随机接入信道的低效率使用,导致UE长时间地访问网络。 本发明解决了在确定UE位置并且在RA请求的发送之前计算UE与NodeB之间的距离和传播延迟的方法的问题,并且传输的定时提前了传播延迟 。
    • 14. 发明申请
    • SYSTEM AND METHOD FOR LINK ADAPTATION IN COMMUNICATION SYSTEMS
    • 用于在通信系统中链接适配的系统和方法
    • WO2002100025A1
    • 2002-12-12
    • PCT/EP2002/004957
    • 2002-05-02
    • TELEFONAKTIEBOLAGET LM ERICSSON (publ)HAARTSEN, Jacobus
    • HAARTSEN, Jacobus
    • H04L1/00
    • H04W52/267H04L1/0009H04L1/0015
    • A system, method, and computer program product for allocating resources to a communication channel between a transmitter and a receiver are disclosed. The receiver implements a procedure that instructs the transmitter to utilize the maximum available banwidth, consistent with maintaining satisfactory communication channel performance. when the performance of the communication channel degrades, the receiver measures the strength of a communication signal received from the transmitter. If the communication signal strength satisfies a threshold, then the bandwidth dedicated to the communication channel may be decreased, and at least one of the number of bits per symbol and coding rate may be increased. By contrast, if the communication signal strength fails to satisfy a threshold, then the transmitter may increase the transmission power and/or reduce the user rate of the communication link.
    • 公开了一种用于向发射机和接收机之间的通信信道分配资源的系统,方法和计算机程序产品。 接收机实现指示发射机利用最大可用禁止带宽的过程,与保持令人满意的通信信道性能一致。 当通信信道的性能下降时,接收机测量从发射机接收的通信信号的强度。 如果通信信号强度满足阈值,则可以减小专用于通信信道的带宽,并且可以增加每个符号的比特数和编码率中的至少一个。 相反,如果通信信号强度不能满足阈值,则发射机可以增加发送功率和/或降低通信链路的用户速率。
    • 15. 发明申请
    • METHOD AND APPARATUS FOR CONTROLLING UPLINK TRANSMISSIONS IN OFDMA SYSTEMS
    • 用于控制OFDMA系统中的上行链路传输的方法和装置
    • WO2009013277A1
    • 2009-01-29
    • PCT/EP2008/059546
    • 2008-07-21
    • TELEFONAKTIEBOLAGET LM ERICSSON (publ)HAARTSEN, Jacobus
    • HAARTSEN, Jacobus
    • H04L5/00H04L5/14
    • H04L5/023H04L5/0007H04L5/0037H04L5/0058H04L5/1484
    • A method for controlling uplink transmissions of a plurality of data bursts in an orthogonal frequency division multiple access system involves determining a first starting time for at least one data burst in the plurality of data bursts associated with a first transceiver of the orthogonal frequency division multiple access system; allocating, for the at least one data burst, a time interval for transmission of the at least one data burst from the first transceiver; and transmitting at least one control message indicating the allocated time interval. The allocating step comprises determining whether a transmission time interval starting at the first starting time and a reception time interval for receiving a downlink data burst overlap at the first transceiver. If the transmission time interval and the reception time interval overlap, a second starting time for the at least one data burst is determined based on the first starting time, and the time interval is allocated to start at the second starting time. On the other hand, if the transmission time interval and the reception time interval do not overlap, the time interval is allocated to start at the first starting time.
    • 一种用于控制正交频分多址系统中的多个数据脉冲串的上行链路传输的方法包括确定与正交频分多址接入的第一收发信机相关联的多个数据脉冲串中的至少一个数据脉冲串的第一起始时间 系统; 为所述至少一个数据脉冲串分配用于从所述第一收发器传输所述至少一个数据脉冲串的时间间隔; 以及发送指示所分配的时间间隔的至少一个控制消息。 分配步骤包括确定从第一起始时间开始的传输时间间隔和用于接收下行链路数据突发的接收时间间隔是否在第一收发器处重叠。 如果发送时间间隔和接收时间间隔重叠,则基于第一开始时间确定至少一个数据脉冲串的第二开始时间,并且分配时间间隔以在第二开始时间开始。 另一方面,如果发送时间间隔和接收时间间隔不重叠,则分配时间间隔以在第一开始时刻开始。
    • 16. 发明申请
    • DETECTING THE PRESENCE OF SPREAD SPECTRUM SIGNALS
    • 检测传播频谱信号的存在
    • WO2009003897A1
    • 2009-01-08
    • PCT/EP2008/058096
    • 2008-06-25
    • TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)HAARTSEN, Jacobus
    • HAARTSEN, Jacobus
    • H04B1/69
    • H04B1/719H04B1/71637H04B1/7183
    • The presence of spread spectrum signals in a given frequency range is detected in a receiver (10) by receiving a signal; determining for a measurement frequency (ωo) an indication signal; and using it as an indication of the presence of spread spectrum signals having a carrier frequency (ωc) equal to said measurement frequency (ωo). An in-phase signal (B) and a quadrature signal (C) are provided by mixing the received signal with an oscillator signal having said measurement frequency (ωo); at least one of these signals is phase shifted; a sum signal (E) and a difference signal (F) are generated; and the sum signal is multiplied by the difference signal and low pass filtered. In this way a method and a circuit of detecting the presence of spread spectrum signals in a given frequency range are provided, which are simple and fast enough to be used in low-cost cognitive radios.
    • 在接收机(10)中通过接收信号来检测给定频率范围内的扩频信号的存在; 确定测量频率(ωo)指示信号; 并将其用作具有等于所述测量频率(ωo)的载波频率(Δc)的扩频信号的存在的指示。 通过将接收信号与具有所述测量频率(ωo)的振荡器信号混合来提供同相信号(B)和正交信号(C); 这些信号中的至少一个是相移的; 产生和信号(E)和差分信号(F); 并且求和信号乘以差分信号并进行低通滤波。 以这种方式,提供了在给定频率范围内检测扩频信号的存在的方法和电路,其简单且足够快以用于低成本认知无线电。
    • 18. 发明申请
    • TRANSMISSION OF INFORMATION ON A TRAINING SEQUENCE
    • 传输信息的训练序列
    • WO2002076053A1
    • 2002-09-26
    • PCT/EP2002/002786
    • 2002-03-13
    • TELEFONAKTIEBOLAGET LM ERICSSON (publ)HAARTSEN, Jacobus
    • HAARTSEN, Jacobus
    • H04L25/03
    • H04L25/03006H04L1/0003H04L1/0025H04L1/0079H04L2025/03789H04L2025/03796
    • A system and method for training a radio receiver to mitigate the effects of ISI caused by multi-path includes receiving a header of a transmitted packet, the header containing at least one flag to identify a training sequence and to indicate whether a training sequence has been inserted into a packet. The receiver decodes the header, to determine whether a training sequence is indicated by the flag, and to select the corresponding training sequence. The training sequence is transmitted at a midamble, between the header and a first segment of the data packet. The received training sequence is compared with the selected reference training sequence, and the equalization parameters of the receiver are adjusted based on the results of the comparison. The selected reference training sequence is modulated using the modulation scheme applied to the payload.
    • 用于训练无线电接收机以减轻由多路径引起的ISI的影响的系统和方法包括:接收所发送的分组的报头,所述报头包含至少一个标志以识别训练序列,并指示训练序列是否已被 插入一个包。 接收机解码报头,确定训练序列是否由标志指示,并选择相应的训练序列。 训练序列在头部与数据分组的第一分段之间的中间码传送。 将接收到的训练序列与所选择的参考训练序列进行比较,并且基于比较的结果来调整接收机的均衡参数。 使用应用于有效载荷的调制方案来调制所选择的参考训练序列。
    • 19. 发明申请
    • METHOD AND DEVICE FOR COMMUNICATING A SIGNAL
    • 用于传播信号的方法和装置
    • WO2007068722A1
    • 2007-06-21
    • PCT/EP2006/069663
    • 2006-12-13
    • TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)HAARTSEN, JacobusEDVARDSSON, MariaDAHLMAN, ErikPARKVALL, Stefan
    • HAARTSEN, JacobusEDVARDSSON, MariaDAHLMAN, ErikPARKVALL, Stefan
    • H04B1/10H04B1/707
    • H04W52/04H04B1/7107H04L1/0001H04L1/0003H04L1/0009H04L1/0015H04L1/18
    • A communication unit (10, 20, 40) and a method for communicating at least one signal over a channel of a first channel type and at least one signal over a channel of a second channel type, which is different from the first channel type. The apparatus comprises a timer (19, 30, 50) adapted to schedule a predetermined time period, during which interference due to simultaneous communication of signals over the channel of the first channel type and the channel of the second channel type is anticipated. Also, the apparatus comprises a processing unit (16, 29, 49) adapted to apply, during the predetermined time period, an interference counteracting process for counteracting interference between any signal communicated over the channel of the first channel type and any signal communicated over the channel of the second channel type. The interference counteracting process comprises changing, during the predetermined time period, from a first to a second format for representing information transmitted over the channel of the first channel type, the second format being more robust than the first format.
    • 通信单元(10,20,40)以及用于通过第一信道类型的信道和不同于第一信道类型的第二信道类型的信道上的至少一个信号来传送至少一个信号的方法。 该装置包括适于调度预定时间段的定时器(19,30,50),在此期间预期由于在第一信道类型的信道上的信号的同时通信和第二信道类型的信道的干扰。 此外,该装置包括处理单元(16,29,49),其适于在预定时间段期间应用干扰抵消处理,用于抵消在第一信道类型的信道上传送的任何信号之间的干扰以及通过第 第二通道类型的通道。 干扰对抗过程包括在预定时间段期间从用于表示通过第一信道类型的信道发送的信息的第一格式改变为第二格式,第二格式比第一格式更健壮。