Packet Data Convergence Protocol: Difference between revisions

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Revision as of 21:16, 31 May 2006

PDCP is an abbreviation for Packet Data Convergence Protocol. It is one of the layers of the Radio Traffic Stack in UMTS and performs IP header compression and decompression, transfer of user data and maintenance of sequence numbers for Radio Bearers which are configured for lossless SRNS relocation.

The compression technique can be based on either RFC 2507 or RFC 3095. RFC 1144 can also be used for some background information, and although the techniques in the RFC are not used in modern TCP/IP implimentations, it still shows what the compression/decompression technique looks like.

If PDCP is configured for No Compression it will send the IP Packets without compression, else it will compress the packets according to it's configuration by upper layer and attach a PDCP header and send the packet. It uses the service provided by a lower layer called RLC.

PDCP header consists of two fields: PID and PDU TYPE. The PDU type field indicates whether the PDU is Data PDU or Sequence Number PDU. The PID field value indicates header compression protocol type used and packet type or CID.

@@ Line 1: / Line 1: @@
+'''PDCP''' is an abbreviation for Packet Data Convergence Protocol.
-{{cleanup-date|March 2006}}
+It is one of the layers of the Radio Traffic Stack in [[Universal Mobile Telecommunications System|UMTS]]
+and performs [[Internet Protocol|IP]] header compression and decompression, transfer of user data
-'''PDCP''' stands for Packet Data Convergence Protocol.
-It is one of the layer of the  Radio Traffic Stack  in UMTS and performs
-IP header compression and decompression, transfer of user data
 and maintenance of sequence numbers for Radio Bearers which are
-configured for loseless SRNS relocation.
+configured for [[Lossless data compression|lossless]] [[Serving Radio Network Subsystem|SRNS]] relocation.
 The compression technique can be based on either RFC 2507 or
-RFC 3095.RFC 1144 can also be used for some help but it's not
+RFC 3095. RFC 1144 can also be used for some background information, and although
+the techniques in the RFC are not used in modern TCP/IP implimentations, it still
-used now a days, still it gives you the idea how does the compression/decompression techniques look like.
+shows what the compression/decompression technique looks like.
-If PDCP is configured for No Compression it will send the
+If '''PDCP''' is configured for ''No Compression'' it will send the
-IP Packets without compression else it will compress the
+IP Packets without compression, else it will compress the
 packets according to it's configuration by upper layer and
-attach PDCP header and send the packet.It uses the service
+attach a '''PDCP''' header and send the packet. It uses the service
-provided by lower layer called RLC.
+provided by a lower layer called RLC.
-PDCP header consists of two fields PID and PDU TYPE.The PDU
+'''PDCP''' header consists of two fields: PID and PDU TYPE. The PDU
-type field indicates whether the PDU is Data PDU or Seq Num PDU.
+type field indicates whether the PDU is Data PDU or Sequence Number PDU.
 The PID field value indicates header compression protocol type
 used and packet type or CID.