Method for processing radio protocol in mobile telecommunications systems and transmitter of mobile telecommunications
An apparatus and method for performing procedures (protocols) of a PDCP (Packet Data Convergence Protocol) layer and an RLC (radio layer in an E-UMTS (Evolved Universal Mobile Telecommunications System) which has evolved from UMTS, among radio protocols of a mobile communication system. The PDCP layer performs ciphering on data (i.e., PDCP SDU) received from an upper layer, generates an indicator discriminating ciphered data and non-ciphered data (i.e., an ROHC feedback packet directly generated by the PDCP layer), and transmits the same to a lower layer (i.e., MAC layer). A PDCP SN (Sequence Number) is defined as an algorithm for ciphering the data in the PDCP layer to perform ciphering in the PDCP layer.
1. A method for processing data in a mobile device, the method comprising:
receiving, by the mobile device, one or more PDCP SDUs (Service Data Units) from an upper layer;
associating, by the mobile device, each of one or more PDCP (Packet Data Convergence Protocol) SNs (sequence numbers) with a respective one of the received one or more PDCP SDUs,
compressing, by the mobile device, a header of the received one or more PDCP SDUs;
ciphering, by the mobile device, the header-compressed one or more PDCP SDUs using a respective one of the one or more PDCP SNs;
adding, by the mobile device, each of the one or more PDCP SNs to respective one of the ciphered one or more PDCP SDUs;
transferring, by the mobile device, the PDCP SN-added ciphered one or more PDCP SDUs to a RLC (Radio Link Control) layer
segmenting or concatenating, by the mobile device, the PDCP SN-added ciphered one or more PDCP SDUs transferred to the RLC layer (hereinafter, referred to as “one or more RLC SDUs”) according to a total size set by a lower layer; and
adding, by the mobile device, each of one or more RLC sequence numbers (SNs) to a respective one of the segmented or concatenated one or more RLC SDUs; and
transferring, by the mobile device, the RLC SN-added segmented or concatenated one or more RLC SDUs to the lower layer,
wherein the method further comprises:
using, by the mobile device, one PDCP SDU of which delivery has not been confirmed, from among the received one or more PDCP SDUs associated with the one or more PDCP SNs, to transfer to the RLC layer at handover.
2. The method of claim 1 , the method further comprising:
generating data independently from the received one or more PDCP SDUs.
3. The method of claim 2 , wherein the data generated independently from the received one or more PDCP SDUs is not ciphered.
4. The method of claim 3 , wherein the data generated independently from the received one or more PDCP SDUs is a feedback data.
5. The method of claim 4 , wherein the data generated independently from the received one or more PDCP SDUs is an ROHC (Robust Header Compression) feedback packet.
6. The method of claim 1 , wherein the PDCP SN-added ciphered one or more PDCP SDUs transferred to the RLC layer are PDCP Protocol Data Units (PDUs).
7. The method of claim 1 , further comprising:
storing the received one or more PDCP SDUs in a PDCP SDU buffer.
8. The method of claim 1 , further comprising:
storing the PDCP SN-added ciphered one or more PDCP SDUs in a RLC SDU buffer.
9. The method of claim 1 , further comprising:
storing the RLC SN-added data in a RLC PDU buffer.
10. The method of claim 1 , wherein the RLC layer is configured to operate in an AM (Acknowledged Mode).
11. A mobile device comprising:
a receiver;
a transmitter; and
a processor operatively connected to the receiver and the transmitter and configured to:
receive one or more PDCP SDUs (Service Data Units) from an upper layer;
associate each of one or more PDCP (Packet Data Convergence Protocol) SNs (sequence numbers) with a respective one of the received one or more PDCP SDUs,
compress a header of the received one or more PDCP SDUs;
cipher the header-compressed one or more PDCP SDUs using a respective one of the one or more PDCP SNs;
add each of the one or more PDCP SNs to a respective one of the ciphered one or more PDCP SDUs;
transfer the PDCP SN-added ciphered one or more PDCP SDUs to a RLC (Radio Link Control) layer
segment or concatenate the PDCP SN-added ciphered one or more PDCP SDUs transferred to the RLC layer (hereinafter, referred to as “one or more RLC SDUs”) according to a total size set by a lower layer;
add each of one or more RLC sequence numbers (SNs) to a respective one of the segmented or concatenated one or more RLC SDUs; and
transfer the RLC SN-added segmented or concatenated one or more RLC SDUs to the lower layer,
wherein the processor is further configured to use one PDCP SDU of which delivery has not been confirmed, from among the received one or more PDCP SDUs associated with the one or more PDCP SNs, to transfer to the RLC layer at handover.