公开(公告)号：WO0031984A2

公开(公告)日：2000-06-02

申请号：PCT/US9927765

申请日：1999-11-23

Applicant: HUGHES ELECTRONICS CORP

Inventor： RAVISHANKAR CHANNASANDRA ,  ROOS DAVID ,  NOERPEL ANTHONY ,  JOSHI CHANDRA ,  HOBZA JAMES ,  DATTA PRABIR ,  CHEN YI

IPC: H04M3/22 ,  H04M3/533 ,  H04Q1/45 ,  H04Q7/20 ,  H04Q1/00

CPC classification number: H04B7/19 ,  H04M3/2281 ,  H04M3/533 ,  H04Q1/45

Abstract: A system and a methodology to improve the end-user quality of service both in terms of response time and reliability for the transport of in-call DTMF signals in wireless systems, particularly in geostationary mobile satellite systems. The methodology encompasses several techniques to provide acceptable end-to-end quality of service for DTMF. A technique is applicable for transport of DTMF in the wireless subscriber to network direction, where DTMF digits are carried in the form of an out-band message. The central part of the technique is to allow multiple key presses in the same message, thereby increasing efficiency and throughput in long-delay environment. Another technique utilizes the vocoder's functionality to carry DTMF in-band, thereby reducing system complexity. The scheme makes the use of an integrated DTMF detector which can classify a given frame of signal into several classes so that the DTMF encoded packet can carry a unique pattern across the air-interface to the voice decoder at AT, which is capable of identifying the pattern. Another technique pertains to the use of a message based DTMF transport between two ATs on a separate logical channel with a unique Service Access Point Identifier (SAPI) providing guaranteed service for DTMF transport in an AT-AT call.

Abstract translation: 在无线系统，特别是对地静止移动卫星系统中，在无线系统中传输呼叫中的DTMF信号的响应时间和可靠性方面，提高最终用户服务质量的系统和方法。 该方法包括几种为DTMF提供可接受的端到端服务质量的技术。 一种技术适用于将无线用户中的DTMF传输到网络方向，其中DTMF数字以带外消息的形式携带。 该技术的核心部分是允许同一消息中的多个按键按压，从而在长时间延迟环境中提高效率和吞吐量。 另一种技术利用声码器的功能来携带DTMF带内，从而降低系统的复杂性。 该方案使用集成的DTMF检测器，其可以将给定的信号帧分类成多个等级，使得DTMF编码的分组可以在AT的语音解码器的空中接口上携带唯一的模式，其能够识别 模式。 另一技术涉及在独立的逻辑信道上的两个AT之间使用基于消息的DTMF传输与唯一的业务接入点标识符（SAPI），在AT-AT呼叫中为DTMF传输提供有保证的服务。

公开(公告)号：WO9903228A9

公开(公告)日：1999-04-15

申请号：PCT/US9814590

申请日：1998-07-13

Applicant: HUGHES ELECTRONICS CORP

Inventor： JOSHI CHANDRA ,  NOERPEL ANTHONY ,  HE XIAOPING

IPC: H04B7/185 ,  H04B7/19 ,  H04B7/204 ,  H04B7/212 ,  H04W74/00 ,  H04W76/02 ,  H04W84/06 ,  H04W99/00 ,  H04L1/18

CPC classification number: H04B7/2125 ,  H04B7/18517 ,  H04B7/18539 ,  H04B7/18543 ,  H04B7/18558 ,  H04B7/18567 ,  H04B7/18571 ,  H04B7/1858 ,  H04B7/18582 ,  H04B7/19 ,  H04B7/2041 ,  H04W28/14 ,  H04W52/0203 ,  H04W52/0216 ,  H04W72/0413 ,  H04W72/042 ,  H04W74/00 ,  H04W76/02 ,  H04W76/045 ,  H04W80/00 ,  H04W84/06 ,  Y02D70/00 ,  Y02D70/1222 ,  Y02D70/164 ,  Y02D70/20 ,  Y02D70/446

Abstract: An approach for error flow control in a communications system involves receiving a plurality of frames of data; determining in said plurality of frames of data, two or more contiguous defective frames of data, the two or more contiguous defective frames of data being followed by at least one frame of data in said plurality of frames that is not defective; forming a group reject message indicative of a range of the two or more contiguous defective frames; transmitting the group reject message; and receiving replacement frames, the replacement frames corresponding to the two or more contiguous defective frames, wherein said at least one frame that is not defective is not received again in response to the group reject message.

Abstract translation: 通信系统中的错误流控制的方法涉及接收多个数据帧; 在所述多个数据帧中确定两个或更多连续缺陷数据帧，所述两个或更多个连续缺陷数据帧后面跟随有所述多个帧中的至少一个非有缺陷的数据帧; 形成指示所述两个或更多个连续的有缺陷帧的范围的组拒绝消息; 发送组拒绝消息; 以及接收替换帧，所述替换帧对应于所述两个或更多个连续的有缺陷帧，其中所述至少一个非有缺陷的帧不响应于所述组拒绝消息而被再次接收。