Disclosed is a method and an apparatus for transmitting and receiving data via a MAC protocol in a mobile communication system. The method includes inputting at least one service data unit (SDU) containing transmission data through a corresponding logical channel and generating at least one first protocol data unit (PDU) that includes said at least one SDU without including multiplexing information for identification of the logical channel, by a first transmission entity; acquiring the first PDU and generating a second PDU including the first PDU in a payload of the second PDU, by a second transmission entity that operates between the first transmission entity and a physical layer; inserting the multiplexing information for identification of the logical channel corresponding to said at least one first PDU into header information of the second PDU; and transmitting the second PDU through the physical layer. The method can reduce load due to additional processing, such as a bit operation or memory copying, in a receiver requiring high speed data transmission.
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0. 29. A transmitting device, comprising:
a transceiver; and
a controller configured to:
obtain, by a first entity of the transmitting device, a plurality of service data units (SDUs),
generate, by the first entity of the transmitting device, a protocol data unit (PDU) comprising the plurality of SDUs and a plurality of headers, wherein each of the plurality headers corresponds to each of the plurality of SDUs, and
deliver, by the first entity of the transmitting device, the generated PDU to a second entity,
wherein each of the plurality of headers and the generated PDU are respectively byte aligned in length, and
wherein each of the plurality of headers includes a logical channel identifier field corresponding to each of the plurality of SDUs.
0. 25. A method performed by a transmitting device in a wireless communication system, the method comprising:
obtaining, by a first entity of the transmitting device, a plurality of service data units (SDUs);
generating, by the first entity of the transmitting device, a protocol data unit (PDU) comprising the plurality of SDUs and a plurality of headers, wherein each of the plurality of headers corresponds to each of the plurality of SDUs; and
delivering, by the first entity of the transmitting device, the generated PDU to a second entity of the transmitting device,
wherein each of the plurality of headers and the generated PDU are respectively byte aligned in length, and
wherein each of the plurality of headers includes a logical channel identifier field corresponding to each of the plurality of SDUs.
0. 31. A receiving device, comprising:
a transceiver; and
a controller configured to:
receive, by a first entity of the receiving device, a protocol data unit (PDU) comprising a plurality of service data units (SDUs) and a plurality of headers, wherein each of the plurality of headers corresponds to each of the plurality of SDUs,
identify, by the first entity of the receiving device, each of a plurality of logical channel identifiers corresponding to each of the plurality of SDUs based on the plurality of headers,
identify, by the first entity of the receiving device, each of the plurality of SDUs, based on each of the identified plurality of logical channel identifiers, and
deliver, by the first entity of the receiving device, each of the identified plurality of SDUs to a second entity of the receiving device,
wherein each of the plurality of headers and the PDU are respectively byte aligned in length, and
wherein each of the plurality of headers include a logical channel identifier field corresponding to each of the plurality of SDUs.
0. 27. A method performed by a receiving device in a wireless communication system, the method comprising:
receiving, by a first entity of the receiving device, a protocol data unit (PDU) comprising a plurality of service data units (SDUs) and a plurality of headers, wherein each of the plurality of headers corresponds to each of the plurality of SDUs;
identifying, by the first entity of the receiving device, each of a plurality of logical channel identifiers corresponding to each of the plurality of SDUs based on the plurality of headers;
identifying, by the first entity of the receiving device, each of the plurality of SDUs, based on each of the identified plurality of logical channel identifiers; and
delivering, by the first entity of the receiving device, each of the identified plurality of SDUs to a second entity of the receiving device,
wherein each of the plurality of headers and the PDU are respectively byte aligned in length, and
wherein each of the plurality of headers includes a logical channel identifier field corresponding to each of the plurality of SDUs.
0. 1. A method for transmitting data via a MAC (Media Access Control) protocol in a mobile communication system, the method comprising the steps of:
inputting at least one service data unit (SDU) containing transmission data through a corresponding logical channel and generating at least one first protocol data unit (PDU) that includes said at least one SDU without including multiplexing information for identification of the logical channel, by a first transmission entity;
acquiring the first PDU and generating a second PDU including the first PDU in a payload of the second PDU, by a second transmission entity that operates between the first transmission entity and a physical layer;
inserting the multiplexing information for identification of the logical channel corresponding to said at least one first PDU into header information of the second PDU; and
transmitting the second PDU through the physical layer.
0. 2. The method of
0. 3. The method of
0. 4. The method of
0. 5. The method of
0. 6. The method of
0. 7. A method for receiving data via a MAC protocol in a mobile communication system, the method comprising the steps of:
receiving, by a first reception entity, a first PDU including header information and a payload through a physical layer;
reading multiplexing information for identification of a logical channel corresponding to at least one second PDU contained in the payload and format information of said at least one second PDU, from the header information of the first PDU; and
identifying the second PDU from the payload based on the format information and delivering the identified second PDU to a second reception entity.
0. 8. The method of
0. 9. The method of
0. 10. The method of
0. 11. The method of
0. 12. The method of
0. 13. An apparatus for transmitting data via a MAC protocol in a mobile communication system, the method comprising:
a first transmission entity for inputting at least one service data unit (SDU) containing transmission data through a corresponding logical channel and generating at least one first protocol data unit (PDU) that includes said at least one SDU without including multiplexing information for identification of the logical channel; and
a second transmission entity for acquiring the first PDU and generating a second PDU including the first PDU in a payload of the second PDU, inserting the multiplexing information for identification of the logical channel corresponding to said at least one first PDU into header information of the second PDU, and transmitting the second PDU through the physical layer, the second transmission entity operating between the first transmission entity and a physical layer.
0. 14. The apparatus of
0. 15. The apparatus of
0. 16. The apparatus of
0. 17. The apparatus of
0. 18. The apparatus of
0. 19. An apparatus for receiving data via a MAC protocol in a mobile communication system, the apparatus comprising:
a first reception entity for receiving a first PDU including header information and a payload through a physical layer, reading multiplexing information for identification of a logical channel corresponding to at least one second PDU contained in the payload and format information of said at least one second PDU, from the header information of the first PDU, identifying the second PDU from the payload based on the format information, and outputting the second PDU; and
a second reception entity for delivering the second PDU to a higher layer entity.
0. 20. The apparatus of
0. 21. The apparatus of
0. 22. The apparatus of
0. 23. The apparatus of
0. 24. The apparatus of
0. 26. The method of claim 25, wherein each of the plurality of headers further includes a length field indicating a length of each of the plurality of SDUs.
0. 28. The method of claim 27, wherein each of the plurality of headers further includes a length field indicating a length of each of the plurality of SDUs.
0. 30. The transmitting device of claim 29, wherein each of the plurality of headers further includes a length field indicating a length of each of the plurality of SDUs.
0. 32. The receiving device of claim 31, wherein each of the plurality of headers further includes a length field indicating a length of each of the plurality of SDUs.
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Moreover, when a MAC-d PDU includes a C/T field having a size of 4 bits, even though a MAC header has a size corresponding to a multiple of one byte, the byte alignment is broken again, which causes unnecessary processing load within the UE.
Furthermore, in the case of employing the structure of
Referring to
The ciphering block 514 encodes MAC-d PDUs and the UL TFC selecting block 512 selects a TFC indicating transport formats of transmission channels used for UL transmission. The C/T MUXs 510 and 506 analyze header information of the MAC-d PDUs, so as to demultiplex the MAC-d PDUs into MAC-d SDUs or generate MAC-d PDUs by multiplexing the MAC-d SDUs with header information. The deciphering block 508 decodes the encoded MAC-d SDUs. The switching block 504 maps MAC-d SDUs (which are also called “MAC SDUs”) of a Dedicated Control Channel (DCCH) and a Dedicated Traffic Channel (DTCH), which are logical channels, to corresponding transmission channels according to the transmission channel types.
Referring to
The HARQ processor 610 receives MAC-hs PDUs from the physical layer on an HS-DSCH for supporting HSDPA and performs an HARQ operation. Then, the HARQ processor 610 delivers the MAC-hs PDUs successfully received through the HARQ operation to the reordering queue distribution block 608. The reordering queue distribution block 608 analyzes header information of the MAC-hs PDUs and delivers the analyzed MAC-hs PDUs to the reordering queues 606 corresponding to the associated DCHs. The reordering queues 606 store the MAC-hs PDUs until the C/T MUXs 612 read the MAC-hs PDUs. The C/T MUXs 612 located between the reordering queues 606 and the disassembly blocks 604 refer to C/T fields contained in MAC-hs headers of the MAC-hs PDUs, so as to identify and demultiplex MAC-hs SDUs contained in the MAC-hs PDU based on corresponding logical channels. The disassembly blocks 604 disassemble the demultiplexed data delivered from the C/T MUXs 612 into MAC-hs SDUs corresponding to each of the logical channels, and then outputs the disassembled MAC-hs SDUs as MAC-d PDUs to the MAC-d entity.
As described above, according to the embodiment of the present invention, a C/T field is inserted into each MAC-hs header, and a MAC-hs entity identifies the multiplexed logical channels within a MAC-hs PDU by using the inserted C/T fields. Since MAC-d PDUs having the same size are used during one TTI for the logical channels, the MAC-d PDUs of the logical channels identified by the C/T fields have the same size. Therefore, MAC-d PDUs included in a data part corresponding to one logical channel identified by a C/T field have the same SID/N/F field values.
As described above, the MAC-hs entity performs identification of the logical channels. Therefore, the MAC-d PDU does not have to contain header information for identification of logical channels.
Referring to
Herein, the combination of the SID field 820, the N field 822, the F field 824, and the C/T field 826 represents a format of each of the multiplexed logical channels. The combination is repeated within the MAC-hs header 802 as many times as the number of multiplexed logical channels. By using the structure of the MAC-hs header 802 as described above, it is possible to construct the MAC-d PDU format while identifying logical channels, even without repeatedly using a plurality of identical fields for multiple MAC-d PDUs of one logical channel.
The order of the information fields located in the above-described combination can be variously selected according to the design of a system. As shown in
A Header Padding (HP) field 830 is appended to the end of the MAC-hs header 802. The HP field 830 is a variable field having a bit size of 0 to 7. The bit size is determined from among values of 0 to 7 such that the entire MAC-hs header has a size corresponding to a multiple of one byte (8 bits). All of the bit values contained in the HP field 830 usually have a value of zero (all ‘0’). The end of the MAC-hs header 802 except for the HP field 830 is identified by an F field having a value of “1”. Therefore, a UE can recognize that the first MAC-hs SDU (i.e. MAC-hs payload 804) starts from the first byte directly following the F field having a value of “1.”
Meanwhile, when the MAC-hs PDU does not include plural multiplexed logical channels, the MAC-hs header 802 does not have to contain C/T fields for identification of the logical channels. Therefore, a C/T field is set to have a particular value that is not used for identification of a logical channel, for example, “1111”, as a value for indicating “No multiplexing (Non MUX).” When a UE identifies that the first C/T field has a value of “1111”, the UE determines that there exists no more C/T field. For example, Table 1 below shows definition of values of the C/T field.
C/T field
definition
0000
LC 1
0001
LC 2
. . .
. . .
1110
LC 15
1111
Non Mux
Referring to
Herein, only one combination of the SID field 920, the N field 922, the F field 924, and the C/T field 926 exists within the MAC-hs header 302, and the C/T field 926 is set to “1111,” which indicates that no logical channel multiplexing is used, and the F field 924 is set to have a value of “1” in order to indicate that it is the end of the MAC-hs header.
A Header Padding (HP) field 930 is appended to the end of the MAC-hs header 902. The HP field 930 is a variable field having a bit size of 0 to 7. The bit size is determined from among values of 0 to 7 such that the entire MAC-hs header has a size corresponding to a multiple of one byte (8 bits).
A MAC-d transmission entity provided at a transmitter in order to support the MAC-hs formats as shown in
Referring to
On the other hand, when logical channel multiplexing has been used, the receiver initializes a variable “n” for identification of logical channels to zero in step 1012. Then, in step 1014, the receiver increases the value of the variable “n” by one. In step 1016, the receiver reads a combination of CTn, SIDn, and Nn from the MAC-hs header and stores the read combination. Then, in step 1018, the receiver determines if an Fn field subsequent to the read combination of the information fields has a value of “1,” in order to determine if it is the end of the MAC-hs header. As a result of the determination in step 1018, when the Fn field does not have a value of “1”, the receiver returns to step 1014 in order to read a next information field of the MAC-hs header. Otherwise, the receiver proceeds to step 1008.
In step 1008, the receiver decodes at least one combination of the stored CTk, SIDk, and Nk (wherein k=0, 1, . . . , n), identifies at least one MAC-d PDU contained in the MAC-hs PDU according to the decoded CTk, SIDk, and Nk, and delivers the at least one MAC-d PDU to a MAC-d entity. which is a higher layer entity. In this case, the MAC-hs entity of the receiver delivers the C/T field extracted from the MAC-hs header to the MAC-d entity, so that the MAC-d entity can refer to the extracted C/T field in delivering the MAC-d PDU to an RLC layer entity through a corresponding logical channel. In step 1010, the receiver removes the information fields, the HP field, and the padding of the stored MAC-hs header, and then terminates the operation.
In the present invention as described above, it is possible to remove a bit operation and a bit offset managing operation, which may occur due to unaligned bytes in a header field, and it is possible to prevent waste of system resources due to memory copying, in a mobile communication system. That is, in the present invention, identification of logical channels is performed by a MAC-hs entity, and appending of a header padding (HP) field guarantees byte alignment for layer-2 PDUs. Moreover, the present invention can reduce load due to additional processing, such as a bit operation or memory copying, in a receiver requiring high speed data transmission.
While the present invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Oh, Jin-Young, Lee, Seung-hyun
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