JP2008178099A - Apparatus, and associated method for selecting whether to reject as invalid data segment received at communication station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a corrupted radio block from being erroneously received as valid. <P>SOLUTION: The present invention relates generally to a manner by which to determine whether to reject, or to accept, the data of a data segment received at a communication station, such as an EDGE-capable mobile station of a GPRS/EDGE, cellular communication system. More particularly, the present invention relates to apparatus, and an associated method, by which to make determination of whether to reject, or to accept, the contents of a data segment as invalid, or valid, responsive to measurement of the BER (bit error rate) of the header part of the data segment. A bit error rate measurer measures the bit error rate of a header part of a received radio block. The measured bit error rate is compared against a selected threshold. Results of the comparison are determinative of whether the radio block is accepted as valid or rejected as corrupted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention generally relates to a method for deciding whether to reject or receive data segment data received at a communication station, eg, GPRS / EDGE EDGE-capable mobile station, cellular communication station. More particularly, the invention relates to an apparatus for determining whether to reject or receive data segment content as invalid or valid in response to a BER (bit error rate) measurement of the header portion of the data segment, and It relates to related methods.

  If the header portion is FEC protected by forward error correction (FEC) encoding and shows a BER worse than the selected threshold, the data segment is considered invalid and is discarded. Conventional schemes simply use data segment payload CRC (Cyclic Redundancy Check Character) analysis to determine whether a data segment is received as valid and tend to pass the CRC check incorrectly. A data segment due to the BER measurement of the header portion of the data segment and in the use of determining whether to reject the data segment as invalid, due to the payload portion of the data segment incorrectly passing the CRC check An erroneous receipt with the effective is prevented.

(Background of the Invention)
Digital communication technology is widely used in many different types of communication systems. In general, the use of digital communication technology allows data to be communicated at a significantly higher data throughput rate and with higher efficiency than data communication enabled through the use of traditional analog communication technology. To do. The information to be communicated is converted or otherwise provided in digital form. Typically, the data is formatted according to a standardized formatting scheme that is known to both the originating station where the data originates and the receiving station where the data ends. The transmitting and receiving stations are connected to each other via a communication channel through which data is communicated. In a wireless communication station, a communication channel is defined at least in part on a wireless link extending between the communication stations.

  In an actual communication system, the communication channel is incomplete. That is, the data is sometimes distorted during its communication on the communication channel. The information content of the data is distorted once received at the receiving station. If the distortion is significant, the information content of the data cannot be recovered.

  Various schemes have been developed that provide methods to correct or correct distortions introduced into the data. Encoding data prior to data communication is one such type of scheme to increase data redundancy. Then, communicating a known value or sequence of values is also sometimes used to determine whether the data received at the receiving station has been sufficiently decoded.

  An exemplary digital cellular communication system, GPRS / EDGE (Extended Data for General Packet Radio Service / GSM Development) cellular communication system is encoded between the originating and receiving stations according to the performance of the EDGE communication service. Communicate data. Data formatted into radio blocks is sent by the originating station to the receiving station. The radio block includes a header portion and a payload portion. The payload portion of the radio block includes a 12-bit CRC (cyclic redundancy check character) and is optionally FEC protected. The header portion of the radio block includes an 8-bit CRC and is also FEC (forward error correction) protected stronger than the payload portion. The CRC of the payload portion of the radio block is used to determine whether the payload portion has been correctly decoded. However, it is sometimes possible to make an erroneous determination that the payload portion has been correctly decoded even though the payload portion has been decoded in error. That is, an incorrect decision is made. For a 12-bit long CRC, a random data block may incorrectly pass the CRC check once every 4,096 times. In long data transfers, tens of thousands of radio blocks can be received. In bad signal conditions, some corrupted radio blocks pass the CRC check and are erroneously received as valid.

  Once the data is received as valid, the data is passed through a higher logical layer and forms part of a data block, a PDU (packet data unit). Higher layer data blocks are typically formed from many lower layer radio blocks. If a bad or destroyed radio block forms part of a higher layer data block, the higher data layer data block is also destroyed. When corruption is detected, it can happen that all of the radio blocks of the higher layer data block are subsequently subsequently retransmitted, resulting in significant delays and many unnecessary retransmissions. In addition, higher layer retries are sometimes based on timeouts. Destruction at higher layers also stops data flow until the timer expires, triggering retransmission of data blocks. Stopping data flow leads to poor data processing speed.

  Therefore, an improved method that further ensures that a corrupted radio block is not erroneously received as valid is advantageous.

  The significant improvements of the present invention have developed in the context of information related to the communication of data using digital communication technology.

  The present invention further provides the following means.

(Item 1)
A device (36) for selecting whether to receive a received data segment as valid, the data segment (52) having a header portion (54) and a payload portion (56), the device ( 36)
Payload partial error measurer (38), wherein the payload partial error measurer (38) is adapted to check a cyclic redundancy check character (CRC) in the payload portion (56) of the data segment (52) A payload part error measurer (38) that provides a signal indicating the passing of the CRC check of the payload part when the CRC in the payload part passes the CRC check;
A header part error measurer (42), wherein the header part error measurer (42) is operatively connected to the payload part and indicates that the CRC of the payload part has passed the CRC check Is adapted to analyze the header portion (54) of the data segment (52), and the error measure (42) of the header portion determines the bit error rate of the header portion. A header partial error measurer (42) configured to measure;
A data segment acceptor (48), wherein the data segment acceptor (48) is at least in pass of the CRC check and the bit error rate of the header portion measured by the header portion error measurer (42). A device (36), characterized in that, in response, the data segment acceptor (48) is configured to selectively receive the data segment as valid.

(Item 2)
And further comprising a comparator (44) adapted to receive the indication of the bit error rate measured by the header partial error measurer (42), the comparator (44) comprising the bit error rate of the bit error rate. The apparatus (36) of item 1, wherein the apparatus (36) is configured to compare the display with a first selected threshold.

(Item 3)
The data segment acceptor (48) is adapted to receive an indication of the comparison made by the comparator, and in response to the indication of the comparison, the data segment acceptor (48) The device (36) of item 2, received as valid.

(Item 4)
The apparatus (36) of item 2, wherein the selected threshold comprises a selected one of a first selected value and at least a second selected value.

(Item 5)
The data segment (52) is encoded by a selected encoding scheme, and a selected one of the first selected value and at least the second selected value is each selected by the selection The apparatus (36) of item 4, which is responsive to a coded encoding scheme.

(Item 6)
A threshold selector (46) adapted to receive an indication of the selected encoding scheme, the threshold selector (46) being responsive to the indication of the selected encoding scheme; The apparatus (36) of item 5, wherein the apparatus (36) is configured to select the selected one of the first selected value and at least the second selected value.

(Item 7)
The data segment (52) is received at a mobile station (12), which is defined from a logical layer perspective, the header partial error measurer (42) and the data segment acceptor (48). The apparatus (36) of item 1, embodied in the first logical layer.

(Item 8)
The mobile station (12) further comprises a second logical layer logically disposed on the first logical layer, wherein the data segment acceptor (48) The apparatus (36) of item 7, further configured to provide the value of the payload portion to the second logical layer.

(Item 9)
Item 9. The item of item 8, wherein the payload portion of the data segment received as valid and provided to the second logical layer forms a portion of a second logical layer data block once provided thereto. Device (36).

(Item 10)
The data segment acceptor (48) has the bit error rate measured by the header partial bit error rate measuring device (42) better than a first selected threshold value and the payload partial error measuring device (38). The apparatus (36) of item 1, wherein the apparatus (36) is configured to receive the data segment as valid if the bit error rate measured by is better than a second selected threshold.

(Item 11)
The data segment (52) comprises an EDGE formatted data segment, the EDGE formatted data segment being configured as part of a data block after receipt by the data segment acceptor (48). The device (36) of claim 1.

(Item 12)
A method (132) of selecting whether to receive a received data segment as valid, the data segment having a header portion and a payload portion, the method (132) comprising:
Characterized by performing (108) a cyclic redundancy check character (CRC) check on the payload portion, and if the CRC in the payload portion passes the CRC check,
Measuring (134) the bit error rate of the header portion;
Determining (136) whether the bit error rate of the header portion is better than a first selected threshold;
If the CRC in the payload portion passes the check and the bit error rate in the header portion is better than the first selected threshold, then
During the act of determining that the bit error rate of the header portion is better than the first selected threshold, the data segment is received as valid 138 at least in response to the determination. (132).

(Item 13)
13. The method (132) of item 12, further comprising the act of selecting the first selected threshold.

(Item 14)
The data segment is encoded according to a selected encoding scheme, and the selection of the first selected threshold is responsive to the selected encoding scheme during the selecting operation, item 13 The described method (132).

(Item 15)
13. The method (132) of item 12, further comprising an act of measuring a CRC of the payload portion.

(Item 16)
16. The method (132) of item 15, wherein the receiving operation is further responsive to the CRC of the payload portion.

(Summary)
An apparatus for determining whether to receive as valid a data segment, eg, a radio block communicated according to an EDGE communication session, and an associated method. The bit error rate measuring device measures the bit error rate of the header portion of the received radio block. The measured bit error rate is compared to a selected threshold. The result of the comparison determines whether the radio block is received as valid or rejected as destroyed.

(Detailed description)
Accordingly, the present invention provides an apparatus for deciding whether to reject or receive as valid data the data segment received in a communication station, eg, GPRS / EDGE EDGE-capable mobile station, cellular communication system, And related methods are advantageously provided.

  Through operation of an embodiment of the present invention, in response to a BER (bit error rate) measurement of the header portion of a data segment, an aspect for determining whether to accept or reject the contents of the data segment as valid Provided.

  In one aspect of the invention, the header portion of the data segment that is FEC protected by forward error correction (FEC) coding exhibits a BER that is worse than the selected threshold, and the data segment is rejected, ie, the data segment is It is determined whether it is not received as valid data. The data segment includes both a header portion and a payload portion. Both, eg the header and the payload part are FEC protected with a header part that is FEC protected stronger than the payload part.

  In another aspect of the invention, when a data segment is received, the bit error rate measurement measures the bit error rate of the header portion of the data segment. In a normal communication scenario, a large number of data segments and radio blocks are received continuously. In such a scenario, the bit error rate measurement measures the bit error rate of each data segment received at the communication station. In other implementations, other good quality indicia measurements are made in the header portion of the data segment.

  In another aspect of the invention, the bit error rate of the header portion of the data segment is compared to a threshold once measured by the bit error rate meter. If the bit error rate is worse than the threshold, the data segment is rejected as invalid. That is, if the BER in the header portion of the data segment is worse than the threshold, it can be concluded that the payload portion of the data segment is reasonably inferior. Data segment rejections are reasonably inferior in quality. The rejection of the data segment eliminates the possibility that other mechanisms will erroneously determine that the data segment is valid.

  In another aspect of the present invention, a threshold with which the measured bit error rate is compared is selectable. That is, the threshold value is a selected value, and is selected from a plurality of different threshold values. The determination of whether a segment should be rejected as invalid data is made, in part, depending on the choice of threshold. In one implementation, the data segment is encoded according to a selected encoding scheme of the plurality of encoding schemes. Different encoding schemes have different encoding parameters. The selection of the threshold is responsive, for example, to the encoding scheme used to encode the data of the data segment. In the course of a normal scenario where a large number of data segments are communicated in succession, if the encoding scheme in which the data segments are encoded changes, the threshold value used for comparison purposes is correspondingly variable. is there.

  In another aspect of the invention, a CRC check is first performed on the payload portion of the data segment before the bit error rate of the header portion is measured by the bit error rate meter. If the payload portion of the data segment passes the CRC check, the bit error rate meter then measures the bit error rate of the header portion of the data segment. The measured bit error rate is then compared to a threshold value to determine whether to accept the data segment as valid or to reject the data segment. Thus, the data segment must pass both a CRC check on the payload portion and a bit error rate measurement test on the header portion in order to be received as valid. If a data segment is mistakenly received as valid due to having passed the CRC check in error, the data segment is not received as valid. This is because the bit error rate measurement and the comparison with the threshold are further performed. Even after passing the CRC check, the receipt of the data segment is only conditionally received. In order for a data segment to be received as valid, it must pass a bit error rate measurement test in the header portion. Alternatively, a BER measurement is first performed and used to determine if the BER is better than a threshold. If it is better than the threshold, a CRC check is performed on the payload portion.

  In another aspect of the present invention, the radio block is formed of a header portion and a payload portion. Both header and payload parts are FEC and CRC protected. However, the header part is FEC protected stronger than the payload part. Even if the payload part value distortion and its CRC check become unreliable due to the stronger FEC protection of the header part, the BER measurement of the header part remains unchanged. The BER measurement is performed on the header portion of the radio block as a check added to the CRC check performed on the payload portion, for example.

  In another aspect of the invention, when a data segment is received as valid, the data is sent to a higher logical layer, and the data, ie, the payload portion, forms a portion of a data block, eg, a PDU (packet data unit). Used to do. By verifying that the bit error rate in the header portion of the lower logical layer data segment is better than the threshold, the higher layer data block containing the data in the sent data segment may contain corrupted data There are few. Improved communication performance results.

  Accordingly, in these and other aspects, an apparatus and associated method is provided for selecting whether to receive a data segment received as valid. The data segment has a header portion and a payload portion. The header part error measurer is adapted to analyze the header part of the data segment. The header partial error measurer is configured to measure the bit error rate of the header portion. The data segment acceptor is configured to selectively receive the data segment as valid in response at least in part to the bit error rate of the header portion measured by the header portion error meter.

  Thus, referring initially to FIG. 1, a communication system, generally designated 10, provides wireless communication with a mobile station, with mobile station 12 representing the mobile station.

  Communication is performed between the mobile station and the portion of the network represented here by the radio access network (RAN) 14. Communication is performed via a wireless air interface represented by segment 16, data originating from the network on segment 16 is sent to mobile station 12, and data originating from the movement is transmitted via the wireless air interface. To a radio access network and a communication device coupled thereto. The radio access network is coupled to an external network represented here by a packet data network (PDN) 18. The communication device, for example, the communication device 22 is arranged in communication connection with the packet data network. The communication device represents a communication end point of communication with the mobile station 12 according to the communication session.

  In an exemplary implementation, the wireless portion of the communication system is GSM / GPRS / EDGE (Global System for Mobile Communications / General Packet Radio Service / Extended Data for GSM Development), a cellular that provides high-speed data communication services. Including communication systems. More generally, the wireless portion of a communication system represents any of a variety of communication systems that provide data services via communication of data segments. In an exemplary implementation, such data segments, sometimes referred to as EDGE, are each formed from a header portion and a payload portion. Thus, while the following description describes exemplary operations with respect to an exemplary implementation of a cellular communication system that provides EDGE communication services, the teachings of the present invention apply equally to other types of communication systems. Is possible. Furthermore, downlink communication is described. Uplink communication is similar and is the operation of the components in the network portion of system 10 and is not shown separately but can operate similarly.

  The mobile station includes transceiver circuitry, here represented by a receive (RX) portion 26 and a transmit (TX) portion 28. Data communicated to the mobile station is received at the receiving portion, and data communicated by the mobile station is transmitted by the transmitting portion. When the mobile station is used according to the performance of a data communication service, a radio block, i.e. a data segment, is received at the mobile station. Due to fading conditions, noise, receiver front end distortion, and other causes that distort the value of the data segment, the value of the data segment operated on the mobile station is different from the corresponding value when sent. If the mobile station cannot correct the distortion, either through its correction or transmission, a communication problem results. As previously mentioned, an incorrect radio block may be received as valid when CRC (Cyclic Redundancy Check Character) analysis is performed. If a data block received as valid is sent to a higher logical layer, the passage of the erroneously received data block is higher when the entire data block formed by many radio blocks must be transmitted Layer communication problems, and possibly significant communication delays.

  In accordance with the operation of an embodiment of the present invention, mobile station 12 further includes an apparatus, generally designated 36, of an embodiment of the present invention. Device 36 is formed from functional components that can be implemented in any desired manner, for example, by an algorithm that can be executed by processing circuitry. The functions performed by the device components can be further implemented at any location, for example, by the mobile station controller or as part of the mobile station transceiver circuitry.

  Here, the apparatus includes a payload partial error measurer 38, a header partial error measurer 42, a comparator 44, a threshold selector 46, and a data segment acceptor 48.

  A data segment 52, or radio block, is also shown in FIG. 1, along with its header portion 54 and payload portion 56. When a data segment is received at the mobile station, the received portion detects its delivery at the mobile station. A representation of the data segment is then provided to the payload partial error measurer, here represented by line 62. In an exemplary implementation, the payload portion error measurer includes a CRC checker that checks the CRC contained in the payload portion of the received data segment. If the CRC check passes the check, i.e., passes the CRC check, an indication of that pass is provided to the header partial error measurer 42, here as represented by line 64. An indication of the detected data segment is provided by line 62 and is also provided to the header partial error measurer. The error measurer operates to measure the bit error rate of the header portion of the radio block provided herein. A display of the measurement results is then provided on line 72. In an exemplary implementation, the header partial error measurer operates only if an indication that the CRC check was successfully passed is provided by the payload partial error measurer.

  The bit error rate value measured by the header partial error measurer 42 is compared in a comparator with a threshold value represented here as being provided by line 76. In the exemplary implementation, the threshold is a selectable value and is selected by the threshold selector 46. The result of the comparison performed by the comparator is provided to the data segment acceptor 48, here represented by line 82. The data segment acceptor selects whether the data segment provided to it on line 62 is received as valid. If the data segment is received as valid, the data segment is passed, as indicated here by line 84. If the result of the comparison indicates that the bit error rate in the header portion of the data segment is worse than the selection threshold applied to line 76, the data segment acceptor does not receive the data segment as valid and the data segment is not in line 66. It will be rejected by the rejection indication generated above. Here, line 66 extends to the transmitting portion of the mobile station where the rejection indication is returned to the network requesting retransmission of the rejected data segment. Since detection is done for errors in the lower logic layer, the errors are corrected quickly and without delay. When an entire group of radio blocks formed from data segments is incorporated into packet data units or other data blocks that are similarly formed from multiple data segments, errors are detected at a higher logical layer Only the delay can be associated with. In an alternative embodiment, the header part BER measurement and analysis is performed before the CRC check performed on the payload part.

  In the exemplary implementation, the operation of the threshold selector that selects the threshold applied to the comparator 44 by line 76 is made in response to an input applied to the selector by line 92. Line 92 shows the level of encoding of the data segment detected in the receiving part of the mobile station. The encoding scheme is one of nine encoding levels designated as MCS-1 to MCS-9 in a communication session in which EDGE data is provided. In response to the encoding scheme used, the threshold selector selects the threshold used in response to the encoding scheme. Therefore, the result of the comparison and the operation of the acceptor 48 also depend in part on the threshold value selected by the selector.

  FIG. 2 shows a process diagram, generally indicated at 102, representing the process of operation of an embodiment of the present invention. The process begins as indicated by start block 104 and detects a data segment, eg, an EDGE radio block, as indicated by block 106.

  As indicated by block 108, a CRC check is performed on the payload portion of the detected data segment. As indicated by decision block 112, a determination is made as to whether the payload portion of the data segment has passed the CRC check. If not, it does not branch and the data segment is rejected, as indicated by block 114. Conversely, if the CRC check is passed, the process branches to yes. Passing the CRC check is only a conditional receipt of the data segment. The yes branch extends to block 116 where a bit error rate measurement of the header portion of the received data segment is performed. A comparison is then made between the measured bit error rate and the selected threshold, as indicated by block 118. As displayed by decision block 122, a determination is made as to whether the result of the comparison is indicating that the bit error rate is better or worse than the selected threshold. If it is worse than the selected threshold, it branches to rejection and proceeds to rejection block 114. Otherwise, if branching to receipt, the data segment is received as valid and the data segment is transferred to a higher logical layer, as indicated by block 126. When delivered to a higher logical layer, the data segment becomes part of a larger data block, eg, a packet data unit.

  FIG. 3 shows a method flow diagram, generally indicated at 132, representing the method of operation of an embodiment of the present invention. The method facilitates the selection of whether to receive a received data segment as valid. The data segment has a header portion and a payload portion.

  First, as indicated by block 134, the bit error rate of the header portion of the data segment is measured. A determination is then made as to whether the bit error rate of the header portion is better than the first selected threshold, as indicated by block 136.

  Thereafter, as indicated by block 138, the data segment is valid in response at least in part to a determination that the bit error rate of the header portion is better than the first selected threshold.

  In this way, a method is provided for determining the validity of a received data segment based on the measurement of the bit error rate in the header portion of the data segment. Traditional schemes rely only on the analysis of the CRC contained in the payload portion of the data segment and tend to erroneously receive the data segment as valid, but with additional or alternative analysis of the bit error rate in the header portion Supplemented or improved. Problems associated with erroneously receiving data in a corrupted data segment as valid are reduced.

FIG. 1 shows a functional block diagram of a wireless communication system in which embodiments of the present invention can operate. FIG. 2 shows a process diagram representing the process of operation of an embodiment of the present invention. FIG. 3 shows a method flow diagram representing a method of operation of an embodiment of the present invention.

Explanation of symbols

12 mobile station 36 device 38 payload part error measurer 42 header part error measurer 44 comparator 46 threshold selector 48 data segment acceptor 52 data segment 54 header part 56 payload part

Claims (16)

A device (36) for selecting whether to receive a received data segment as valid, the data segment (52) having a header portion (54) and a payload portion (56), the device ( 36)
Payload partial error measurer (38), wherein the payload partial error measurer (38) is adapted to check a cyclic redundancy check character (CRC) in the payload portion (56) of the data segment (52) A payload part error measurer (38) that provides a signal indicating the passing of the CRC check of the payload part when the CRC in the payload part passes the CRC check;
A header part error measurer (42), wherein the header part error measurer (42) is operatively connected to the payload part and indicates that the CRC of the payload part has passed the CRC check Is adapted to analyze the header portion (54) of the data segment (52), and the error measure (42) of the header portion determines the bit error rate of the header portion. A header partial error measurer (42) configured to measure;
A data segment acceptor (48), wherein the data segment acceptor (48) is at least in pass of the CRC check and the bit error rate of the header portion measured by the header portion error measurer (42). A device (36), characterized in that, in response, the data segment acceptor (48) is configured to selectively receive the data segment as valid.   The apparatus further comprises a comparator (44) adapted to receive the indication of the bit error rate measured by the header partial error meter (42), the comparator (44) The apparatus (36) of claim 1, wherein the apparatus (36) is configured to compare the display with a first selected threshold.   The data segment acceptor (48) is adapted to receive an indication of the comparison made by the comparator, and in response to the indication of the comparison, the data segment acceptor (48) The apparatus (36) of claim 2, wherein the apparatus (36) receives as valid.   The apparatus (36) of claim 2, wherein the selected threshold comprises a selected one of a first selected value and at least a second selected value.   The data segment (52) is encoded by a selected encoding scheme, and a selected one of the first selected value and at least the second selected value is each selected by the selection The apparatus (36) of claim 4, which is responsive to a coded encoding scheme.   Further comprising a threshold selector (46) adapted to receive an indication of the selected encoding scheme, wherein the threshold selector (46) is responsive to the indication of the selected encoding scheme. 6. The apparatus (36) of claim 5, wherein the apparatus (36) is configured to select the selected one of the first selected value and at least the second selected value.   The data segment (52) is received at a mobile station (12), which is defined from a logical layer perspective, the header partial error measurer (42) and the data segment acceptor (48). The apparatus (36) of claim 1, embodied in a first logic layer.   The mobile station (12) further comprises a second logic layer logically disposed on the first logic layer, wherein the data segment acceptor (48) The apparatus (36) of claim 7, further configured to provide a value of the payload portion to the second logical layer.   9. The payload portion of the data segment received as valid and provided to the second logical layer forms a portion of a second logical layer data block once provided thereto. Device (36).   The data segment acceptor (48) has the bit error rate measured by the header partial bit error rate measurer (42) better than a first selected threshold and the payload partial error measurer (38). 2. The apparatus (36) of claim 1, wherein the apparatus is configured to receive the data segment as valid if the bit error rate measured by is better than a second selected threshold.   The data segment (52) comprises an EDGE formatted data segment, the EDGE formatted data segment being configured as part of a data block after receipt by the data segment acceptor (48). Item 36. Item 36. A method (132) of selecting whether to receive a received data segment as valid, the data segment having a header portion and a payload portion, the method (132) comprising:
Characterized by performing (108) a cyclic redundancy check character (CRC) check on the payload portion, and if the CRC in the payload portion passes the CRC check,
Measuring (134) the bit error rate of the header portion;
Determining (136) whether the bit error rate of the header portion is better than a first selected threshold;
If the CRC in the payload portion passes the check and the bit error rate in the header portion is better than the first selected threshold, then
During the act of determining that the bit error rate of the header portion is better than the first selected threshold, the data segment is received as valid 138 at least in response to the determination. (132).   The method (132) of claim 12, further comprising an act of selecting the first selected threshold.   The data segment is encoded according to a selected encoding scheme, and the selection of the first selected threshold is responsive to the selected encoding scheme during the selecting operation. (132).   The method (132) of claim 12, further comprising an act of measuring a CRC of the payload portion.   The method (132) of claim 15, wherein the receiving operation is further responsive to the CRC of the payload portion.

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