EP0651523A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Communication receiver using soft decision to discriminate between a traffic channel frame and a fast associated control channel frame
Assignee: NEC Corp
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Filing: 1994-10-23
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Granted: —
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Expires: 2014-10-23
Abstract
Abstract In a digital cellular communication system, a cell-site station transmits a frame containing a fixed number of burst signals each having stealing flag bits indicating that the frame is a traffic channel (TCH) or a fast associated control channel (FACCH). A mobile station receives delay-dispersed burst signals and equalizes their delay-dispersal effects to produce soft information so that each of the transmitted stealing flag bit is represented by a multibit value. A channel discriminator provides a total sum of all the multibit values of the received burst signals and compares the sum to a threshold value to identify the received frame as a FACCH if the sum is equal to or greater than the threshold value, or identify it as a TCH if the sum is smaller than the threshold value.
Inventors
- 👤 Yashuhiro C/O Nec Corporation Saegusa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 06:13
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/22; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
A method of channel discrimination between a traffic channel frame and a fast associated control channel frame, comprising the steps of: a) receiving a frame containing a fixed number of delay-dispersed burst signals, each burst signal containing information bits and/or control bits, and at least one stealing flag bit indicating the presence or absence of the control bits; b) equalizing delay-dispersal effects of the burst signals and producing therefrom soft information representing the stealing flag bit of each burst signal by a multibit value; c) summing all the multibit values of all the burst signals of the received frame to produce a count value; and d) comparing said count value to a threshold value to determine that the received frame is the fast associated control channel frame if the count value is equal to or greater than the threshold value and that the received frame is the traffic channel frame if the count value is smaller than the threshold value.
Claim 2
Dependent Claim
30 words
A method as claimed in claim 1, further comprising the steps of: detecting the quality of the received frame; and varying the threshold value in accordance with the detected quality.
Claim 3
Dependent Claim
151 words
A communication receiver comprising: means (211) for receiving a frame containing a fixed number of delay-dispersed burst signals, each burst signal containing information bits and/or control bits, and at least one stealing flag bit indicating the presence or absence of the control bits; means (212) for equalizing delay-dispersal effects of the burst signals and producing therefrom soft information representing the stealing flag bit of each burst signal by a multibit value; mans (306; 316) for summing all the multibit values of all the burst signals of the received frame to produce a count value; and means (305, 315) for comparing said count value to a threshold value to determine that the received frame is a fast associated control channel if the count value is equal to or greater than the threshold value and that the received frame is a traffic channel if the count value is smaller than the threshold value.
Claim 4
Dependent Claim
33 words
A communication receiver as claimed in claim 1, further comprising: means (340) for detecting the quality of the received frame; and means (341) for varying said threshold value according to the detected quality.
Claim 5
Dependent Claim
153 words
A soft decision channel discriminator for a communication receiver which receives a frame containing a fixed number of delay-dispersed burst signals each containing information bits and/or control bits, and at least one stealing flag bit indicating the presence or absence of the control bits, and equalizes delay-dispersal effects of the burst signals to produce soft information representing the stealing flag bit of each burst signal by a multibit value, the discrimination circuit comprising: means (306; 316) for summing all the multibit values of all the burst signals of the received frame to produce a count value; and means (305; 315) for comparing said count value to a threshold value to determine that the received frame is a fast associated control channel if the count value is equal to or greater than the threshold value and that the received frame is a traffic channel if the count value is smaller than the threshold value.
Claim 6
Dependent Claim
35 words
A soft decision channel discriminator as claimed in claim 5, further comprising: means (340) for detecting the quality of the received frame; and means (341) for varying said threshold value according to the detected quality.
References Cited (Backward Citations)
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