Title :
Cross-Layer Interactions in UMTS Evolved UTRAN (E-UTRAN)
Author :
Bucknell, P. ; Baker, M.P.J.
Author_Institution :
Philips Res. Lab., Redhill
Abstract :
In this paper, we describe possible interactions between UMTS Layer 2 and Layer 1 protocols to gain throughput performance improvements. The effect of transmission errors in hybrid ARQ (HARQ) control signalling is shown along with the improvements that are possible by tighter coupling of medium access control (MAC) layer HARQ and radio link layer control (RLC) layer ARQ level retransmissions. It is shown how the number of RLC segments in the MAC SDU affects the design of the required reliability of the ACK and signalling. MAC HARQ "NACK to ACK" errors can cause considerable throughput reductions, which can be substantially alleviated by the use of HARQ error recovery techniques.
Keywords :
3G mobile communication; access protocols; telecommunication network topology; HARQ error recovery; UMTS Layer 1 protocols; UMTS Layer 2 protocol; UMTS evolved UTRAN; cross-layer interactions; hybrid ARQ control signalling; medium access control; radio link layer control; throughput performance improvements; throughput reductions; transmission errors; 3G mobile communication; Access protocols; Automatic repeat request; Couplings; Error correction; Media Access Protocol; Performance gain; Radio control; Radio link; Throughput;
Conference_Titel :
Wireless Communication Systems, 2007. ISWCS 2007. 4th International Symposium on
Conference_Location :
Trondheim
Print_ISBN :
978-1-4244-0979-2
Electronic_ISBN :
978-1-4244-0979-2
DOI :
10.1109/ISWCS.2007.4392342
