BRPI0412271B1 - Apparatus for relaying a higher level data frame in a radio communications system, Apparatus for receiving at least one lower level data frame in segmented parts, method for relaying a higher level data frame in a radio communication system, and method for receiving segmented portions of at least one top-level frame in a radio communications system - Google Patents

Description

(54) Title: APPLIANCE FOR RETRANSMITTING A TOP LEVEL DATA FRAMEWORK IN A RADIO COMMUNICATIONS SYSTEM, APPLIANCE FOR RECEIVING AT LEAST ONE LOWER LEVEL FRAME IN SEGMENTED PARTS, METHOD FOR RETRANSMITTING A TOP LEVEL DATA FRAMEWORK COMMUNICATIONS VIA RADIO AND METHOD FOR RECEIVING SEGMENTED PARTS OF AT LEAST ONE HIGHER LEVEL FRAMEWORK IN A COMMUNICATIONS SYSTEM VIA RADIO (51) lnt.CI .: H04L 1/18; H04L 29/06; 1/16 H2O; H04L 29/08; H04W 28/04; H04W 80/02; H04L 1/00 (30) Unionist Priority: 07/02/2003 US 10 / 612,477 (73) Holder (s): NOKIA TECHNOLOGIES OY (72) Inventor (s): MARK W. CHENG; LIANGCHI HSU (85) National Phase Start Date: 01/02/2006

APPLIANCE FOR RETRANSMITTING A LEVEL DATA FRAME

SUPERIOR IN A RADIO COMMUNICATIONS SYSTEM, APPLIANCE

TO RECEIVE AT LEAST ONE PIECE OF LOWER LEVEL IN PIECES

SEGMENTED, METHOD FOR RETRANSMITTING A FRAMEWORK DATA TABLE

TOP LEVEL IN A RADIO COMMUNICATIONS SYSTEM AND METHOD FOR RECEIVING SEGMENTED PARTS AT LEAST ONE TOP LEVEL FRAMEWORK IN A RADIO COMMUNICATIONS SYSTEM

The present invention generally relates to a radio communication system, such as the IS-2000-compliant cellular communication system, which communicates formatted frames, or other packaged formatted data according to a feedback warning and retransmission scheme. receiving hybrid ARQ (HRAQ), or other. More particularly, the present invention relates to an apparatus, and an associated method, by which to coordinate packet retransmissions when the acknowledgment schemes and packet format feedback are performed on multiple logical layers of the radio communications system. . The present invention also, more particularly, relates to an apparatus, and an associated method, by which to better control the generation of negative acknowledgment requests when data frames are retransmitted and data rates lower than transmission rates. initial data.

Coordination between logical layers is provided to allow early retransmission, when necessary, of a data frame. When an indication of a data frame distribution failure is detected in a lower logical layer, an indication of the failed distribution is provided to

Petition 870180049905, dated 06/11/2018, p. 13/20 ϋΒ high logic level and data retransmission is started. Multilayer feedback receipts are eliminated. When data frame retransmission occurs at a reduced data rate, an indication of a faulty distribution is less likely to be generated merely due to the reduced data frame retransmission rate. When implemented in a CDMA-2000 cellular communications system that provides reverse link lxEV-DV communication services, better communications are provided. Better communication control when segmented frames are retransmitted is provided, and better coordination between RLP and H-ARQ retransmissions is provided.

BACKGROUND OF THE INVENTION

Many aspects of modern society require the communication of data according to the performance of communication services. The need for data communication must therefore continue and perhaps increase as advances in communication technologies allow additional types of communication services to be provided.

Data is communicated through a communications system. A communication system includes, at a minimum, a set of communication stations including a first communication station and a second communication station. The communication stations are interconnected through a communication channel. Data is originated at a first of the communication stations, referred to as a transmission station. The data is sent by the transmitting station over the communication channel to be distributed, at least, to a second of the communication stations, referred to as the receiving station. The receiving station detects the data communicated to it and operates to retrieve its informational content.

A radio communications system is a communications system that uses radio channels over which it communicates data between

5 ° the communication stations. Radio channels are formed over radio links defined over a radio air interface. Wireless communication systems, in contrast, require a fixed connection, that is, a wired line, between the communication stations on which to form communication channels that allow data communication between them.

Radio communications systems provide several advantages that sometimes favor their use over corresponding wire communications systems. The physical infrastructure of a radio communications system, for example, is generally relatively less expensive to install than that of a corresponding wired communications system. Initial expenses for a radio communication system, therefore, are generally less than that of the corresponding wired communication systems. Additionally and significantly, a radio communications system can be implemented as a mobile communications system. In a mobile communications system, mobility of communication is not necessary. That is, one or more of the communications stations in a mobile communications system is moving and not limited to operation in a fixed position.

A cellular communications system is a type of radio communications system that has reached significant levels of use. The networks of various cellular communication systems have been used to cover very populous parts of the world. Telephone communications are provided through networks of cellular communications systems through the use of mobile stations. That is, radio communications are performed during operation of the cell communications system between a network part of the communications system and a mobile station to perform a communication service.

The area covered by the cellular communications system is defined by the placement of base station transceiver stations. The base transceiver stations each define a coverage area, referred to as a cell, and the aggregated areas of the cells defined by the coverage areas of all those base transceiver stations together define the area covered by the system. The network portion of the cellular communications • system also includes control entities and entities that allow connection to other communication networks, such as PSTNs (networks *

public switched telephony) or PDNs (packet data networks), such as the Internet.

A mobile station, when used to communicate data, normally communicates with the base transceiver station positioned very close to the mobile station. In this way, the mobile station communicates with the base transceiver station that defines the cell in which the mobile station is positioned.

Successive generations of cellular communications systems have been developed and employed. New generation systems are being used and others are under development. Some of the new generation systems are referred to as third generation (3G) systems. In general, these systems are based, at least in part, on packet-based communication schemes. In a packet communication scheme, data to be communicated is formatted in packets, and packet formatted data is communicated in the form of a series of data packets to communicate the data corresponding to a communication service.

The operating parameters are from an example of a third generation communication system presented in an operational specification referred to as the CDMA 2000 operational specification. The operating parameters presented in the CDMA 2000 operational specification provide packet-based data communication and services. Other operational parameters related to high-speed data communication services have also been enacted to provide the performance of high-speed communication services in the CDMA 2000 system. The lxEV-DV data communication scheme, for example, provides the operational parameters according to which high-speed communication services can be performed in conjunction with a CDMA 2000 communication system. High-speed communication services are performed in any direction, that is, through the network part to a mobile station, as well as, by a mobile station to the network part.

Existing versions of the operational specification define the communication system in terms of logical layers, including an RLP (radio link protocol) logical layer and a MAC (medium access control) layer or sublayer. RLP-formatted data packets, or frames, are formed at the RLP layer, and MAC layer formatting is done at the MAC layer. Both layers use a feedback feedback scheme used to determine whether to relay a data frame. The RLP layer uses a relay scheme based on NAK and the MAC layer uses an H-ARQ scheme.

In addition, the operational specification defines a packet data channel (R-PDCH). Two different types of broadcasts are allowed on this channel. First, autonomous transmission is defined. In autonomous transmission, an “always on”, minimally controlled data connection is provided. When the mobile station operates on an autonomous transmission, the mobile station is allowed to communicate data at an increasing rate up to a predetermined data rate. Scheduled transmission is also defined. In scheduled transmission, the network portion, for example, the base station, determines when the mobile station is allowed to transmit at the next higher rates of autonomous transmission, up to the peak data rate. In addition to the communication of relatively short $ 5 frame lengths, for example, five or ten milliseconds, to improve communication delay performance, hybrid ARQ (HARQ) feedback is also used for the reverse link to reduce the error rate of frame due to power control inaccuracies.

For example, any time the mobile station is required to communicate data, the mobile station is autonomously allowed to transmit at data rates up to a rate, for example, 9.6kbps, specified during call setup procedures. For scheduled transmission, the mobile station requests permission to transmit, and the network part responds with an acceptance, including a fee assignment. The mobile station is then allowed to transmit the data for a permitted period and at a permitted data rate.

Both autonomous and scheduled transmissions use the same type of H15 ARQ feedback receipt mechanism. The H-ARQ scheme displays the attributes of multiple ARQ “channels” and synchronous acknowledgment. Retransmissions of an encoder packet are performed up to a selected number of retransmissions. With the use of H-ARQ reverse link procedures, a symmetric H-ARQ mechanism is provided in the MAC sublayer between the mobile station and the base transceiver station of the communications system.

A problem with the existing communication scheme, presented in the existing version of the operational specification, concerns feedback feedback notices during retransmission of packets or data frames. A frame formatted in RLP must first be communicated in a non-segmented form at a high data rate and then retransmitted in a segmented form at a lower data rate. When retransmitted at the lowest data rate, a base transceiver station forming a receiving station should indicate a data distribution failure due to an interruption caused by its retransmission and a low data rate even though the retransmission of the data frame is in progress. execution.

Additionally, due to the multiple feedback feedback layers, excessive air resources are used to communicate feedback feedback messages across the multiple layers. Multilayer feedback is duplicative and wasteful of radio resources.

If a way could be provided by which it would be better to provide control over the retransmission of data under a receipt acknowledgment feedback scheme, it would therefore be advantageous.

It is in light of the above information regarding the retransmission of data in a packet communication system that significant improvements of the present invention have evolved.

SUMMARY OF THE INVENTION

The present invention, therefore, advantageously provides apparatus, and an associated method, for facilitating the communication of packet data in a radio communication system, such as an IS-2000 cellular communications system. Frame formatted data, or other packet formatted data, are communicated according to an H-ARQ receipt and retransmission notification scheme, or other.

By operating an embodiment of the present invention, a way is provided in which to coordinate frame retransmissions when acknowledgment schemes and packet format feedback are performed on multiple logical layers of the radio communication system.

By also operating an embodiment of the present invention, a way is provided in which it is better to control the generation of negative acknowledgment requests when data frames are retransmitted at lower data rates than initial data transmission rates.

In one aspect of the present invention, coordination between the logical layers is provided, and earlier retransmission, when necessary, of data is allowed. When a data frame failure indication is detected in a lower logical layer, a message is formed therein, forming a failure distribution indication. This message is provided at a higher logical layer level, and retransmission begins. The need for another way to use multi-layer feedback notices is eliminated.

In another aspect of the present invention, indications of flawed distribution are less likely to be generated when data retransmission is performed on segmented parts. That is, when non-segmented data is first transmitted and then retransmitted in a segmented manner at a reduced data rate, an indication of faulty distribution is less likely to be resumed merely because of the lower rate at which the data is retransmitted. False indications of data distribution failure are less likely to occur, resulting in better communication performance, as well as, better use of radio resources in the communications system.

In an implementation example, better communications on a CDMA 2000 cellular communications system that provides lxEV-DV communication services are provided. Better communication control is provided when segmented frames are retransmitted; and better coordination between RLP and H-ARQ transmissions is provided.

The data formatting is carried out in a higher layer, such as an RLP layer (radio link protocol) and, later, provided with a lower logical layer, -like-a_sub-layer_.d.e_ MAC (access control to medium) .MAC, or other low-level formatting is performed, and a resulting quarter is communicated by a transmitting station to a receiving station. Communications at the MAC layer or another lower level are carried out according to a feedback feedback scheme, in particular an H-ARQ feedback scheme.

H-ARQ indications of any successful transmission or failed transmission are resumed to the lower logic level of the transmitting station to be detected there. Responsive to the detection of indications by a detector incorporated in the lower logic layer of the station, a status response generator generates a status response message. The status response message is provided to the RLP or higher level layer to quickly indicate reception indications. When failed data distribution is indicated, the RLP layer or another upper logical layer initiates retransmission to the receiving station.

The receiving station uses a retransmission time marker to determine time periods associated with the distribution of data to it. The data communicated by a transmitting station to the receiving station is communicated in autonomous or programmed transmission modes. Data retransmission should occur at a lower data rate than the initial data transmission. When a determination is made at the receiving station that data is received in a segmented form, indicative of retransmission at a reduced data rate, the segmented portions are buffered in a resupply buffer and a resupply buffer is metered. used to determine when to request subsequent retransmission of data. If a segmented portion of the data is not detected within the time period within which the resupply buffer is stopped, a NAK indication is returned to the station to indicate the failed distribution of the segmented portion of the data. Accommodation is thus done for the retransmission of data at a reduced data rate. Unnecessary * NAK indications, indicating failed data distribution, assuming data retransmission at the lowest data rate.

In this way, improved communications and improved use of radio resources are provided. Multi-level transmission of multi-level feedback receipts is eliminated; and erroneous indications of failed distribution of retransmitted data are less likely to occur.

The receiving station uses a retransmission time meter to determine time periods associated with the distribution of data to it. The data communicated by a station to the receiving station are communicated in autonomous or programmed transmission modes. The data retransmission should occur at a lower data rate than the initial data transmission. At the receiving station where data is received in a segmented form, indicative of retransmission at a reduced data rate, the segmented portions are buffered in a resupply buffer and a resupply buffer is used to determine when request subsequent retransmission of the data. If a segmented portion of the data is not detected within the time period within which the resupply buffer is stopped, a NAK indication is resumed to the station to indicate the failed distribution of the segmented portion of the data. Accommodation is thus done for the retransmission of data at a reduced data rate. Unnecessary NAK indications, indicating failed data distribution, assumed data retransmission at the lowest data rate.

In this way, improved communications and improved use of radio resources are provided. Multi-level transmission of multi-level feedback receipts is eliminated; and erroneous indications of failed distribution of retransmitted data have less

5 * probability of occurring.

In these and other aspects, therefore, apparatus, and an associated method are provided for a radio communications system. The radio communications system has a transmitting station that sends data to a receiving station. The data is formatted in a top-level logical layer and in a top-level data frame. The top level data frame is provided with a lower level logical sublayer. The top level data frame is operable according to an H-ARQ feedback scheme. Retransmissions by the transmitting station of the higher level data frame are facilitated if the receiving station fails to properly receive at least one lower level frame. An H-ARQ detector is incorporated into the lower-level logic sublayer. The H-ARQ detector detects H-ARQ indications, that is, acknowledgment of receipt, resumed by the receiving station to the transmitting station.

An H-AEQ status response generator is incorporated into the low-level logic sublayer. The response generator is adapted to receive indications of detections made by the H-ARQ detector. The H-ARQ status response generator generates an H-ARQ status response message for distribution to the top level logic layer. The message notifies the top level logic layer when the H-AEQ detector detects an H-ARQ indication indicating that the receiving station fails to properly receive at least one lower level frame. The top-level logic layer is selectively operable responsive to receiving the H-ARQ status response message to re-provide the top-level data frame for the low-level logic sublayer.

In these, as well as in other aspects, an additional device, and associated method, is provided for the radio communication system. The receiving station comprises a retransmission timer. The retransmission timer checks a first period of time

Μ starting with at least early reception at the receiving station of at least one lower level frame. The transmitting station, selectively, initially sends at least one lower level frame in segmented portions at a reduced second data rate. Reception of at least one lower level frame in the segmented portions is facilitated. A retransmission timer reset is adapted to receive reception detection indications from the segmented retransmission portions of the lower level frame at the second reduced data rate. The retransmission timer reset causes the retransmission timer to be reset when the lower level frame is retransmitted in the segmented portions.

A full appreciation of the invention and its scope can be obtained from the accompanying drawings summarized below, the detailed description of the presently preferred embodiments of the invention, and the appended claims.

REDUCED DESCRIPTION OF THE DRAWINGS

Fig. 1 illustrates a functional block diagram of a radio communication system in which an embodiment of the present invention is operable.

Fig. 2 illustrates a logic layer representation of portions of the radio communication system shown in Fig. 1 and of the signal generated during the operation of the radio communication system according to the operation of an embodiment of the present invention.

Fig. 3 illustrates a flow chart of the method listing the method of operating the method in an embodiment of the present invention.

Fig. 4 illustrates a representation of an example of reaction between data formatted in an RLP layer and a MAC sublayer of a transmitting station according to an embodiment of the present invention.

(¢ 0

Fig. 5 illustrates a representation of an example of a transmission pattern during the communication system operation example shown in Fig. 1.

Fig. 6 illustrates a representation of an example of • communicating segmented portions of a data frame according to the operation of an embodiment of the present invention.

DETAILED DESCRIPTION

With reference, first, to Fig. 1, a radio communication system, shown generally by 10, provides the communication of data formatted in quaro, table, or other formatted in packet. The communication system forms a multi-user communication system having a plurality of mobile stations, of which the mobile station is representative. Data is communicated according to the performance of communication services, including, for example, VoIP (Voice over Internet Protocol) communication services in real time.

In the implementation example, the radio communication system forms a radio communication system that generally operates according to the operational protocol presented in the operational specification CDMA 2000. The communication system is also representative, however, of other types of communication systems. Although the following description describes an example of operation of an embodiment of the present invention with respect to its implementation in a communications system according to CDM 2000, in other implementations, embodiments of the present invention are similarly implemented in other types of communication systems. communications.

Data is communicated to perform communication services between a network part of the communications system and mobile stations operable in the communications system. When data is communicated by the network part at a mobile station, the data is communicated over forward link channels over a forward link 16; and, when data is communicated by a mobile station to the network part, the data is communicated over reverse link channels defined over a link *

reverse 18.

, 5 The network part includes a radio access network, shown here including base transceiver stations, of which the base transceiver station (BTS) 22 is representative, the base transceiver stations are positioned at selected locations throughout an area covered by the communications system and within which communications to / from a mobile station are permitted. Each base transceiver station in the communications system defines a cell; and, a mobile station generally communicates with the base transceiver station that defines the cell in which the mobile station is positioned. The mobile station 12 and the base transceiver station 22 are, in general, representative of any set of communication stations between which frame-formatted data is communicated during a communication session to perform a communication service.

The communications system according to CDMA 2000 forming the communications system 10 additionally provides lxEV-DV communication services with a high data rate, both in the forward link and in the reverse link. Operation example of the communications system in which the data, originating at the mobile station, are communicated to a base transceiver station will be described. In some respects, analogous operations for forward link communication are similarly implemented.

The radio access network of the network portion of the communications system also includes a base station controller 24, or other control entity. The base station controller controls several aspects of the radio access network, including operation of the base transceiver station 22 to which the controller is attached.

The base station controller 24, in turn, is coupled to a connection point (GWY) 28 that forms a connection point between the radio access network of the network part of the communications system and other portions of the network. Here, connection point 28 connects the radio access network to a packet data network (PDN) 32 and public switched telephone network (PSTN) 34. A corresponding node (CN) 38 is coupled to the data network in package and the public switched telephone network. The corresponding node is representative of any data source or target that forms the final destination source of data communicated during a communication session to perform communication service to / from a mobile station, such as a mobile station 12.

Data originating, for example, at the corresponding node for communication with the mobile station is routed through the network part of the communications system to the base transceiver station, and the base transceiver station transmits the data to the mobile station. And, for example, data originating at the mobile station for communication to the corresponding node is sent over reverse link channels to be detected by the base transceiver station and then to be routed through the network part of the communications system to the node. corresponding.

As previously mentioned, data communication, such as that according to lxEV-DV communication service, is formatted in a frame or otherwise formatted in a package. That is, the communication service is carried out through the communication of successive data frames. And, a feedback feedback scheme is used, by which feedback is provided to indicate at least when data frames are not successfully distributed so that the data frame can be retransmitted.

During reverse link communications, data is communicated by the mobile station over reverse link channels to a base transceiver station. Data frames are sent and sent over link channels to the transceiver station to be detected by it. In the event that the data frame is not successfully distributed to the base transceiver station, an indication of the data frame distribution failure is resumed to the mobile station according to an H-ARQ feedback scheme. Due to the formatting and feedback being conventionally carried out in an RLP layer (radio link protocol) and a MAC layer (access control to the medium), multiple feedbacks, for each layer, are resumed to the mobile station.

The mobile station includes an apparatus, generally shown at 46, which facilitates rapid data transmission in the event of a failed distribution of a data frame to the base transceiver station. The apparatus 46 is shown here as formed from functional entities that are implemented in any desired manner, including, for example, algorithms executable by the electronic processing circuit. In the implementation example, the device is implemented in a MAC (media access control) layer positioned under a RLP (radio link protocol) logic layer.

Here, apparatus 46 includes an H-ARQ 52 detector that operates to detect indications and H-ARQ, indicating a failed distribution of a previously sent data frame. Detection indications made by detector 52 are provided with an H-ARQ 54 status response generator. The status response generator, also incorporated in the MAC layer together with the H-ARQ detector, operates, in turn, to generate a message, indicated here on line 56, which is provided to the RLP layer to indicate the failed distribution of the previously sent frame. When distributed to the layered RLP, the frame formatted in RLP is again provided to the MAC layer to be formed on it and then retransmitted to the base transceiver station. Because the RLP layer is notified immediately of detection in the MA layer of the H-ARQ indication of a failed distribution, the RLP layer more quickly initiates the retransmission of an RLP formatted frame. The need to, on the other hand, wait for the distribution of an RLP layer, NAK (negative acknowledgment of receipt) or other indication indicative of failed frame distribution is eliminated. Improved communications are possible, as well as more efficient use of radio resources allocated to the radio communication system.

Base transceiver stations also include apparatus 46 in an embodiment of the present invention. The apparatus 46 incorporated in the base transceiver stations is also formed of functional entities that are implemented in any desired way, for example, also by algorithms executable by the electronic processing circuit. Apparatus 46 operates during reverse link communications to control when feedback indications are resumed to the mobile station, to indicate failed distribution of a data frame. The apparatus detects when a retransmitted data frame is transmitted in segmented portions at reduced data rates, reduced in relation to a data rate at which the data is first transmitted.

A retransmission timer 58 incorporated in the base transceiver station is associated with a first interruption. The retransmission timer operates to initiate an indication and NAK to be resumed to the mobile station when a data frame is not successfully distributed within a period of time indicated by the first interruption period. When, as previously described, the data is retransmitted in segmented portions, the retransmission is sometimes performed at a very low data rate. The device includes a resuscitation buffer 62 that cushions

G5 segmented portions of the data when the data is retransmitted during communications system operation. The apparatus also includes a retransmission timer reset 64. The retransmission timer reset is coupled to receive buffer indications in the temporary storage of a segmented portion of a retransmitted data frame. Ε, the readjuster is coupled to the retransmission timer when a segmented portion of the retransmitted data is distributed to the base transceiver station to be stored in the resupply buffer. Ε, the apparatus also includes a resupply buffer 66 which operates to measure a second period of time. If the resupply buffer timer interrupts and a segmented portion of the retransmitted data is not successfully distributed to the base transceiver station, an indication is provided to a retransmission request generator 72 that initiates a retransmission request, indicating the portion segmented, or portions, that must be retransmitted to indicate to the mobile station that the missing segmented portion, or portions, of the data frame must be retransmitted to the base transceiver station. DUE to the retransmission timer being reset, the improper generation of NAK indications indicating faulty data distribution, merely due to retransmission at a markedly reduced transmission rate, does not occur. And, through the use of the resupply temporary storage timer and retransmission request generator, retransmission of segmented portions, which are successfully distributed to the base transceiver station, are not retransmitted.

Fig. 2 illustrates a representation of the mobile station 12 and base station 22 that form portions of the radio communications system shown in Fig. 1. Two of the logic layers, the RLP and MAC layers, indicated by 76 and 78, respectively, are shown. Ε, the H19 detector

ARQ 52 and the status response generator 54, used according to the reverse link communications, of device 46 are shown again as embedded in the MAC layer 78-12 of the mobile station.

Fig. 2 also illustrates an arrow 82 representing the communication of H-ARQ indications, such as from the base transceiver station to the mobile station. And, data communication between the layers of the mobile and base stations is indicated by the arrows 84, and communication of receipt notices and denial of receipt notices between the layers is indicated by segment 86 extending between the MAC and RLP layers of the mobile station.

When the message is distributed to the RLP layer, the LP layer begins the subsequent retransmission at an earlier time. Through this operation, RLP-NAK point-to-point control boards do not need to be communicated between the base transceiver station and the mobile station.

Instead, at the MAC layer, the status of the H15 ARQ transmission is provided, and the indication of a successful transmission or an exhaustively failed transmission is passed to the RLP layer, that is, the RLP transmitter. Once the transmitting layer receives the indication of transmission failure, the RLP layer starts retransmitting the failed RLP frames immediately. In other words, RLP retransmissions are no longer * triggered by a negative acknowledgment from the base transceiver station, the RLP reception, but triggered by a NAK notification formed on the transmitting MAC layer 78-12 directly.

On the transmission side, that is, here, the mobile station, so that MAC reports the transmission status of the RLP frames, the layer

RLP indicates RLP sequence numbers passed down to *

MAC sublayer. The MA sublayer keeps track of the numbers of * RLP sequences for all RLP frames that are encapsulated in a physical SFU layer and each H-ARQ channel. That is, the MAC layer associates each RLP sequence number with an H-ARQ information, such as the H-ARQ channel id, subpackage ID, etc. The MAC sublayer then indicates the transmission status of the RLP frames back to the RLP layer, after receiving an ACK from the receiver or exhausting the allowed retransmission to complete the H-ARQ activity. With the indication of H5 ARQ transmission status from the MAC layer, the RLP 76-12 layer initiates the retransmission of failed frames. The RLP layer also frees the memory of successful frames from a transmission buffer in it. This increases not only the efficiency of the use of radio spectrum, that is, much less or no more RLP-NAK indication sent over the radio air interface, but also the memory efficiency produced from the transmitting station.

On the receiving side, that is, the base transceiver station during reverse link communications, layer A and H-ARQ operations are immutable. That is, normal H-ARQ ACK-NAK protocols are executed in the traditional way. However, the RLP receiver, that is, the RLP layer 76-22, when an RLP quaro is detected as missing, RLP starts a WINDOWSETTECTION timer or retransmission timer and waits for a subsequent round of retransmitted frame data before sending a frame control system *

back to the transmitter. Once the transmitter automatically initiates * 20 retransmission of the failed frame, the retransmitted frame will arrive before the timer expires and the NAK control frame is sent from the receiver, less or no more RLP__NAK frame back to the transmitter on the interface. air. The transmitter can be configured to stop sending the NAK control board if the air link is good and ACK / NAK in H-ARQ is reliable.

*

Fig. 3 illustrates a method, generally shown in 92, representative of the transmission procedures performed during communication of data frames to perform a communication service.

First, and as indicated by block 94, all variables * 20

RLP are initialized at the transmitter, that is, the mobile station for communications by reverse link. Then, and as indicated by decision block 102, a determination is made as to whether the transmitter is active. If not, the negative branch is taken to block 98 and operations are interrupted. Otherwise, the positive branch is taken to block 102, and the layered RLP checks data, new or retransmitted data, ready for transmission. High priority is given to retransmitted packets.

Then, as indicated by block 104, the RLP layer sends frames to the MAC layer with its associated RLP sequence numbers (SEQ). For a segmented quaro, the RLP layer also passes down a segment sequence number (S-SEQ) associated with each segmented portion.

In decision block 106, a determination is made as to whether the packet on the H-ARQ channel received acknowledgment of receipt (ACKED). If so, the positive branch is taken to block 108, and the transmission status is indicated by members of the RLP sequence and the circuit is resumed to decision block 96.

If, conversely, the negative branch is brought from decision block 106, the H-ARQ retransmission count is advanced, indicated by block 112. Then, and as indicated by decision block 114, a determination is made as to whether retransmission of H-AR is exhausted. If so, the positive branch is moved to block 108. If not, the negative branch is moved back to block 104. Operations continue, as appropriate.

Fig. 4 illustrates the RLP layer 76-12 and the MAC sublayer 78-12 of the mobile station 12. Here, the procedures that are performed by method 92 are shown. The RLP layer descends to the RLP frames 116 and 118 for the MAC sublayer 78-12. The associated sequence numbers are also passed on. The MAC sublayer multiplies both RLP frames into a physical SDU channel, which is then

6Q encoded for transmission. After the physical layer ARQ procedure, the MAC sublayer 79 notifies the data instance (SR_ID = 1), the transmission status of RLP frames with sequence numbers 3 and 4.

Thus, at the RLP transmitter, that is, the RLP layer 765 12 with feedback from the MAC layer, the RLP layer initiates a subsequent round of retransmission procedures without waiting for NAK control frames from the RLP receiver (layer 76-22 shown in Fig. 2). In addition, on the MAC 78-12 transmitter, the NAK layer must keep track of the RLP sequence numbers of all data blocks that are multiplexed on each physical SDU layer. At the end of the transmission, the status is passed upwards to the RLP layer. Primitives, that is, requests and responses between the MAC and RLP layers are as follows:

Kind of Primitive Parameters Primitive Grades primitive used in Solicitation Dice- Dice, Station RLP distributes an RLP to the MAC size, mobile and MAC sublayer to be seq, Station multiplexed in the physical layer s_seq base SDU; data of the RLP frame or a segment thereof, size is the size of data in bits; sequence is the sequence number of the RLP frame containing data; s__seq is the segment sequence number if the RLP frame is a segmented frame. Solicitation Dice- Ack or nak, Station Indicates transmission status of the MAC seq s_seq mobile RLP frame transmitted over and Station F-PDCH or R-ESCH; base ack__ou_nak is set to NAK to indicate the failed transmission, seq is the sequence number of the acked or naked RLP frame; s_seq is the segment sequence number if the RLP frame is a frame targeted. Fig. 5 illustrates a representation, usually shown in

122, showing programmed and autonomous transmission patterns during operation of the radio communications system shown in Fig. 1. Packet data transmission patterns in which packet data traffic is generally in bursts is shown. RLP frames are distributed in a segmented or non-segmented manner. If a large RLP frame is transmitted at a high non-segmented (programmed) data rate, it is lost and the mobile station is unable to retransmit the RLP frame at the same data rate due to base station loading or rate request delay, the retransmitted RLP frame can be transmitted in a segmented or autonomous mode. In the figure, blocks 124 represent autonomous transmissions and a low data rate, and blocks 126 represent programmed transmissions at a high data rate.

For example, an RLP frame is, for example, transmitted at a peak data rate (1.2 Mbps) with a frame length of 10 ms, but retransmitted in an autonomous mode, for example, 192 bits per encoder packet, sixty and four retransmissions would be required to retransmit the segmented data block. A coding packet subsequent to coding also includes the input bits over the forward / reverse packet data channel consisting of information bits, the frame quality indicator bits, and follower bits. This forms a physical SDU layer. Normally, the RLP transmission timer is set to a full lap time plus one factor to process the delay period. If the complete lap delay is 150ms and a factor is 100ms, the retransmission timer will be 250ms. However, the time required to transmit the sixty-four segmented frames with a frame length of 10ms is 640ms. This causes the RLP receiver to request a third round of RLP transmissions while the transmitter is still conducting a segmented retransmission for the second RLP transmission round.

An effective retransmission scheme is required whenever the retransmitted room is segmented due to an air resource limit.

Fig. 6 illustrates a representation of data retransmission in segmented portions and operation of the apparatus in an embodiment of the present invention by which to unnecessarily limit RLP NAK during segmented RLP frame retransmissions. The top portion of the figure illustrates frames received in a sub-reseating buffer.

When a segment of the retransmitted frame is received, an RLP receiver, the RLP layer 76-22 shown in Fig. 2, must interrupt the retransmission timer for the missing RLP frame and start a resupply buffer, which is used to resupply all frames targeted to the missing frame. Note that a frame is a segmented frame when a segmented data frame format is used. The NAK procedure for the resequencing buffer is started and is similar to that of the RLP buffer for reseating. In Fig. 6, the RLP frame number is 3, so a NAK is sent for retransmission. Before the retransmission timer expires, subpackage 3-1 arrives. Subpackage 31 is a segmented frame with field S_SLQ (segment sequence number) and set to zero. The receiver starts a resupply buffer to wait for the rest of the segments. Segments 3-2 (S_SEQ = 20), 3-4 (S_SEQ = 60), and 3-5 (S_SEQ = 80) etc, all arrive. However, segment 3-3 fails to arrive (S_SEQ = 40) when the delay detection window expires. The RLP receiver then declares the missing segment 3-3 as lost and a NAK control frame is sent to request retransmission for this segment.

So a way is provided, by which I reduced the generation of unnecessary RLP NAK indications.

Preferred descriptions are preferred examples for implementing the invention, and the scope of the invention should not necessarily be limited by this description. The scope of the present invention is defined by the following claims.

1/6

Claims (16)

CLAIMS: 1. A device for relaying a higher level data frame in a radio communications system, having a sending station that sends data to a receiving station, the data formatted in a higher level logical layer and in the level data frame. the upper level data frame provided to a lower level logical sublayer, the upper level data frame formatted in at least one lower level frame, the lower level logical layer operable according to a response H-ARQ, the referred device characterized by understanding: - an H-ARQ detector, incorporated in the lower level logical sublayer, said H-ARQ detector being for detecting HARQ indications returned to the transmitting station; and - an H-ARQ state response generator, incorporated in the lower level logical sublayer of the emitting station, and adapted to receive indications of detections made by said HARQ detector, said H-ARQ state response generator to generate an alarm message. H-ARQ status response for delivery to the top-level logic layer to notify the top-level logic layer of the sending station when the H-ARQ detector detects an H-ARQ indication indicating that at least one low-level frame has not been properly received , the top-level logic layer selectively operable in response to receiving the H-ARQ status response message to again provide the top-level data frame for the lower-level logical sublayer. Apparatus according to claim 1, characterized in that the lower level logical sublayer comprises a MAC layer (Medium Access Control), and wherein said H-ARQ detector and said H-ARQ state response layer are embedded in the MAC layer. Petition 870180049905, dated 06/11/2018, p. 14/20 2/6 Apparatus according to claim 1, characterized in that the top-level logic layer comprises an RLP (Radio Connection Protocol) layer, and in which the H-ARQ status response message is delivered by said response response generator. H-ARQ state to the RLP layer. Apparatus according to claim 1, characterized in that the status response message H-ARQ is further generated to indicate a successful reception of at least one lower level frame. Apparatus according to claim 1, characterized in that the H-ARQ status response message further identifies with which higher level data frame the H-ARQ indications received from said H-ARQ detector are associated. Apparatus according to claim 5, characterized in that the top level data frame formed by the top level logic layer is composed of a sequence number of frames, and wherein the status response message H-ARQ includes an indication of the frame sequence number. Apparatus according to claim 6, characterized in that the top level data frame comprises an RLP (Radio Connection Protocol) frame, and wherein the frame sequence number comprises an RLP sequence number. 8. A device to receive at least one lower level frame in parts segmented to a receiving station in a radio communication system, having a sending station that sends data to a receiving station, the data formatted in a higher level logical layer and to the top level data frame, and the top level data frame provided to a lower level logical sublayer, the top level data frame formatted in at least one lower level frame, in which the receiving station comprises: Petition 870180049905, dated 06/11/2018, p. 15/20 3/6 a retransmission timer, the retransmission timer for timing a first period of time starting with the receiving detection, at the receiving station, of at least one lower level frame, in which the sending station initially selectively sends at least one frame lower level in segmented parts at a reduced second data rate; and a retransmission timer reset, adapted to receive receiving detection indications from the segmented parts of the lower level frame retransmission at the second reduced data rate, said relay timer reset being to cause the retransmission timer to reset when the lower level frame is retransmitted in the segmented parts; the apparatus characterized in that said receiving station further comprises a re-storing storage, said re-storing storage for storing the segmented parts of the lower level structure when delivered to the receiving station. Apparatus according to claim 8, characterized in that the receiving station further comprises a sequencing storage timer, said sequencing storage timer being for timing a second period of time starting with the receiving detection of a segmented part of the structure lower level when retransmitted. Apparatus according to claim 9, characterized in that the second time period programmed by said sequencing storage timer is a period that substantially corresponds to the first time period programmed by the retransmission timer. Apparatus according to claim 9, characterized in that each segment of the segmented parts has a segment identifier associated with it, and in which the receiving station further comprises a motion detector. Petition 870180049905, dated 06/11/2018, p. 16/20 4/6 missing segment to identify, if any, which segmented parts have not been delivered and stored in the resupply storage when the resupply storage reaches the time limit. Apparatus according to claim 11, characterized in that the receiving station further comprises a retransmission request generator, adapted to receive reseeding storage time limit signals, said retransmission request generator being to generate a request for retransmission. NAK retransmission in response to the timeout of the resequencing storage and the detection of at least one missing segment by said missing segment detector. Apparatus according to claim 12, characterized in that the NAK retransmission request comprises missing frame indications detectable by said retransmission timer. 14. A method for relaying a top-level data frame in a radio communications system, having a sending station that sends data to a receiving station, the data formatted in a top-level logical layer and a data frame of top level, and the top level data frame supplied to a lower level logical sublayer, the top level data frame formatted in at least one lower level frame, the lower level logical layer operable according to a plan of H-ARQ responses, such a plan characterized by comprising: - detect, in the low-level logical sublayer, the H-ARQ indications returned by the receiving station to the sending station; - generating an H-ARQ status response message for delivery to the top-level logic layer, to notify the top-level logic layer about a detection, during said detection operation of an H-ARQ indication, indicating that the receiving station failed to adequately receive at least one lower level staff; and Petition 870180049905, dated 06/11/2018, p. 17/20 5/6 - deliver the H-ARQ status response message to the top-level logical layer. Method according to claim 14, characterized in that it further comprises the operation, in response to the delivery of the H-ARQ status response message during said delivery operation, to again supply the top level data frame for the sublayer lower level logic. 16. Method for receiving segmented parts of at least one top-level frame in a radio communications system, having a sending station that sends data to a receiving station, the data formatted in a top-level logical layer and in a frame of top-level data, and the top-level data frame provided to a lower-level logical sublayer, the top-level data frame formatted in a lower-level frame, the lower-level logic layer operable according to a plan of H-ARQ responses, the receiving station comprising a first retransmission timer, the first retransmission timer being for timing a first period of time starting when an absent top level frame is detected at the receiving station, on which the sending station initially sends at least one top-level frame at a first data rate and retransmit, if necessary, segmented parts of at least one higher-level frame at a reduced second data rate, said method comprising: detecting reception at the relay receiving station of the top level data frame at the second reduced data rate; reset the first retransmission timer when at least one top level frame is retransmitted to the segmented parts; and said method characterized by further comprising: store the segmented parts of at least one top level structure when delivered to the receiving station; and Petition 870180049905, dated 06/11/2018, p. 18/20 6/6 synchronize a separately initiated time period for each segmented part of at least one top level frame when the segmented part is detected missing during retransmission. Petition 870180049905, dated 06/11/2018, p. 19/20 2/5 i MS BS