US20030192003A1
Expired / Lapsed
US
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Error detection methods in wireless communication systems
Assignee: Nokia of America Corp
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Filing: 2002-04-05
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Granted: —
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Expires: 2022-04-05
Abstract
Abstract The error detection method includes decoding a portion of each control channel that is simultaneously received by a user equipment (UE) in a wireless communication system. The UE is provided with techniques to determine if one or more of the control channels were successfully received during the decoding step. If more than one control channel was successfully received, the method selects only one of the successfully received control channels based on calculated path metric differences (PMD) that serve as a “tie-breaking” mechanism to select the correct control channel for a particular UE.
Inventors
- 👤 Arnab Das
- 👤 Farooq Khan
- 👤 Ashwin Sampath
- 👤 Hsuan-Jung Su
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:55
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0059; H04L1/006; H03; H03M; H03M13/00; H03M13/03; H03M13/05; H03M13/09; H03M13/29; H03M13/2957; H03M13/2975; H03M13/37; H03M13/39; H03M13/41; H04L1/0045; H04L1/0047; H04L1/005; H04L1/0051; H04L1/0054; H04L1/0064; H04L1/0065; H04L1/0072; H04L1/12; H04L1/16; H04L1/18; H04L1/1812
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
55 words
1 . A method of detecting errors in control channels of a wireless communication system, comprising: decoding at least a portion of each control channel; determining if one or more control channels were successfully received during the decoding step; and selecting one of the successively received control channels based on at least one calculated metric.
Claim 2
Dependent Claim
55 words
1 . A method of detecting errors in control channels of a wireless communication system, comprising: decoding at least a portion of each control channel; determining if one or more control channels were successfully received during the decoding step; and selecting one of the successively received control channels based on at least one calculated metric.
Claim 3
Dependent Claim
19 words
2 . The method of claim 1 , wherein said step of determining includes performing a cyclic redundancy check.
Claim 4
Dependent Claim
20 words
3 . The method of claim 1 , wherein said step of determining includes performing a Yamamoto-Itoh (YI) decoding algorithm.
Claim 5
Dependent Claim
48 words
4 . The method of claim 3 , wherein said step of determining includes using a parity check code appended to each portion of each control channel in conjunction with the YI algorithm to determine if one or more control channels were successfully received during the decoding step.
Claim 6
Dependent Claim
49 words
5 . The method of claim 3 , wherein said step of determining includes using a SCGI code appended to each portion of each control channel in conjunction with the YI algorithm in order to determine if one or more control channels were successfully received during the decoding step.
Claim 7
Dependent Claim
42 words
6 . The method of claim 1 , wherein said step of determining includes using a parity check code appended to each portion of each control channel to determine if one or more control channels were successfully received during the decoding step.
Claim 8
Dependent Claim
41 words
7 . The method of claim 1 , wherein said step of determining includes using a SCGI code appended to each portion of each control channel to determine if one or more control channels were successfully received during the decoding step.
Claim 9
Dependent Claim
58 words
8 . The method of claim 1 , wherein said step of selecting comprises: calculating a path metric difference (PMD) metric for each control channel determined as successfully received, when more than one control channel are successfully received as determined by said determining step, and selecting one of the successfully received control channels based on the calculated PMDs.
Claim 10
Dependent Claim
41 words
9 . The method of claim 8 , wherein said step of calculating includes calculating at least one of a minimum path metric difference (MPMD) metric, an aggregate path metric difference (APMD) metric, and a frequency path metric difference (FPMD) metric.
Claim 11
Dependent Claim
80 words
10 . The method of claim 9 , wherein said step of calculating an MPMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and retaining a minimum difference metric value by which the winning path at each state beat a competing path at said each state, wherein the winning path having the largest minimum difference metric value corresponds to the one successfully received control channel selected in the selecting step.
Claim 12
Dependent Claim
79 words
11 . The method of claim 9 , wherein said step of calculating an APMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and retaining an aggregate sum of the PMDs by which the winning path at each state beat a competing path at said each state, wherein the winning path having the largest aggregate sum corresponds to the one successfully received control channel selected in the selecting step.
Claim 13
Dependent Claim
87 words
12 . The method of claim 9 , wherein said step of calculating an FPMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and counting a number of times by which the winning path at each state came within a threshold value of beating a competing path at said each state, wherein the winning path having the lowest frequency of coming within said threshold corresponds to the one successfully received control channel selected in the selecting step.
Claim 14
Dependent Claim
67 words
13 . A method of detecting errors in control channels of a wireless communication system, comprising: decoding at least a portion of each control channel; performing a Yamamoto-Itoh (YI) decoding algorithm to determine if one or more control channels were successfully received during the decoding step; and selecting one of the successively received control channels determined by the YI algorithm based on at least one calculated metric.
Claim 15
Dependent Claim
67 words
13 . A method of detecting errors in control channels of a wireless communication system, comprising: decoding at least a portion of each control channel; performing a Yamamoto-Itoh (YI) decoding algorithm to determine if one or more control channels were successfully received during the decoding step; and selecting one of the successively received control channels determined by the YI algorithm based on at least one calculated metric.
Claim 16
Dependent Claim
54 words
14 . The method of claim 13 , wherein said step of selecting comprises: calculating a path metric difference (PMD) metric for each control channel, when more than one control channel are successfully received as determined by said YI algorithm, and selecting one of the successfully received control channels based on the PMDs calculated.
Claim 17
Dependent Claim
41 words
15 . The method of claim 14 , wherein said step of calculating includes calculating at least one of a minimum path metric difference (MPMD) metric, an aggregate path metric difference (APMD) metric, and a frequency path metric difference (FPMD) metric.
Claim 18
Dependent Claim
80 words
16 . The method of claim 15 , wherein said step of calculating an MPMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and retaining a minimum difference metric value by which the winning path at each state beat a competing path at said each state, wherein the winning path having the largest minimum difference metric value corresponds to the one successfully received control channel selected in the selecting step.
Claim 19
Dependent Claim
79 words
17 . The method of claim 15 , wherein said step of calculating an APMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and retaining an aggregate sum of the PMD's by which the winning path at each state beat a competing path at said each state, wherein the winning path having the largest aggregate sum corresponds to the one successfully received control channel selected in the selecting step.
Claim 20
Dependent Claim
87 words
18 . The method of claim 15 , wherein said step of calculating an FPMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and counting a number of times by which the winning path at each state came within a threshold value of beating a competing path at said each state, wherein the winning path having the lowest frequency of coming within said threshold corresponds to the one successfully received control channel selected in the selecting step.
Claim 21
Dependent Claim
73 words
19 . A method of detecting errors in control channels of a wireless communication system, comprising: decoding at least a portion of each control channel, each portion including a parity check code that is appended thereto; determining if one or more control channels were successfully received during the decoding step by using the appended parity check code; and selecting one of the successively received control channels based on at least one calculated metric.
Claim 22
Dependent Claim
73 words
19 . A method of detecting errors in control channels of a wireless communication system, comprising: decoding at least a portion of each control channel, each portion including a parity check code that is appended thereto; determining if one or more control channels were successfully received during the decoding step by using the appended parity check code; and selecting one of the successively received control channels based on at least one calculated metric.
Claim 23
Dependent Claim
42 words
20 . The method of claim 19 , wherein said determining step includes performing a Yamamoto-Itoh (YI) decoding algorithm in conjunction with using the parity check code to determine if one or more control channels were successfully received during the decoding step
Claim 24
Dependent Claim
54 words
21 . The method of claim 19 , wherein said step of selecting comprises: calculating a path metric difference (PMD) metric for each control channel, when more than one control channel are successfully received as determined by said YI algorithm, and selecting one of the successfully received control channels based on the PMDs calculated.
Claim 25
Dependent Claim
41 words
22 . The method of claim 21 , wherein said step of calculating includes calculating at least one of a minimum path metric difference (MPMD) metric, an aggregate path metric difference (APMD) metric, and a frequency path metric difference (FPMD) metric.
Claim 26
Dependent Claim
79 words
23 . The method of claim 22 , wherein said step of calculating an MPMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and retaining a minimum difference metric value by which the winning path at each state beat a competing path at said each state, wherein the winning path having the largest minimum difference metric value corresponds to the one successfully received channel selected in the selecting step.
Claim 27
Dependent Claim
79 words
24 . The method of claim 22 , wherein said step of calculating an APMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and retaining an aggregate sum of the PMD's by which the winning path at each state beat a competing path at said each state, wherein the winning path having the largest aggregate sum corresponds to the one successfully received control channel selected in the selecting step.
Claim 28
Dependent Claim
87 words
25 . The method of claim 15 , wherein said step of calculating an FPMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and counting a number of times by which the winning path at each state came within a threshold value of beating a competing path at said each state, wherein the winning path having the lowest frequency of coming within said threshold corresponds to the one successfully received control channel selected in the selecting step.
Claim 29
Dependent Claim
101 words
26 . A method of detecting errors in control channels that are transmitted from a base station to a plurality of user-equipments (UEs) in a wireless communication system, comprising: decoding at least a portion of each control channel at a UE, each portion including a scrambling code group identifier (SCGI) code that is appended thereto; determining if one or more control channels were successfully received during the decoding step by checking whether the appended SCGI code corresponds to a scrambling code group of the UE; and selecting one of the successively received control channels based on at least one calculated metric.
Claim 30
Dependent Claim
101 words
26 . A method of detecting errors in control channels that are transmitted from a base station to a plurality of user-equipments (UEs) in a wireless communication system, comprising: decoding at least a portion of each control channel at a UE, each portion including a scrambling code group identifier (SCGI) code that is appended thereto; determining if one or more control channels were successfully received during the decoding step by checking whether the appended SCGI code corresponds to a scrambling code group of the UE; and selecting one of the successively received control channels based on at least one calculated metric.
Claim 31
Dependent Claim
42 words
27 . The method of claim 26 , wherein said determining step includes performing a Yamamoto-Itoh (YI) decoding algorithm in conjunction with using the parity check code to determine if one or more control channels were successfully received during the decoding step
Claim 32
Dependent Claim
54 words
28 . The method of claim 25 , wherein said step of selecting comprises: calculating a path metric difference (PMD) metric for each control channel, when more than one control channel are successfully received as determined by said YI algorithm, and selecting one of the successfully received control channels based on the PMDs calculated.
Claim 33
Dependent Claim
41 words
29 . The method of claim 28 , wherein said step of calculating includes calculating at least one of a minimum path metric difference (MPMD) metric, an aggregate path metric difference (APMD) metric, and a frequency path metric difference (FPMD) metric.
Claim 34
Dependent Claim
80 words
30 . The method of claim 29 , wherein said step of calculating an MPMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and retaining a minimum difference metric value by which the winning path at each state beat a competing path at said each state, wherein the winning path having the largest minimum difference metric value corresponds to the one successfully received control channel selected in the selecting step.
Claim 35
Dependent Claim
79 words
31 . The method of claim 29 , wherein said step of calculating an APMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and retaining an aggregate sum of the PMD's by which the winning path at each state beat a competing path at said each state, wherein the winning path having the largest aggregate sum corresponds to the one successfully received control channel selected in the selecting step.
Claim 36
Dependent Claim
87 words
32 . The method of claim 15 , wherein said step of calculating an FPMD metric comprises: performing Viterbi decoding to determine a winning path metric at each of a plurality of states, and counting a number of times by which the winning path at each state came within a threshold value of beating a competing path at said each state, wherein the winning path having the lowest frequency of coming within said threshold corresponds to the one successfully received control channel selected in the selecting step.
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